Fix ARM toolchain #L6803W Relocation warnings

While building with ARM toolchain relocation warnings appears
This commit will fix it for MAX32625/30 targets.

The system interrupt function is defined as weak in startup file
and its overvides in other files, Becuase of the functions is overrites
while calling it in startup modile by B XXXXX probably compiler give
info purpose warnings... By using using . instead function name it says
go existing point to the compiler.
Warning detail:
https://www.keil.com/support/man/docs/armerr/armerr_dom1365073159742.htm

Signed-off-by: Sadik.Ozer <[email protected]>

Author: Sadik.Ozer

targets/TARGET_Maxim/TARGET_MAX32625/device/TOOLCHAIN_ARM_STD/startup_MAX32625.S

@@ -138,47 +138,47 @@ __SPIN
 
 NMI_Handler             PROC
                         EXPORT NMI_Handler                      [WEAK]     
-                        B       NMI_Handler
+                        B       .
                         ENDP
 
 HardFault_Handler       PROC
                         EXPORT HardFault_Handler                [WEAK]             
-                        B       HardFault_Handler
+                        B       .
                         ENDP
 
 MemManage_Handler       PROC
                         EXPORT MemManage_Handler        [WEAK]
-                        B       MemManage_Handler
+                        B       .
                         ENDP
 
 BusFault_Handler        PROC
                         EXPORT BusFault_Handler         [WEAK]
-                        B       BusFault_Handler
+                        B       .
                         ENDP
 
 UsageFault_Handler      PROC
                         EXPORT UsageFault_Handler       [WEAK]
-                        B       UsageFault_Handler
+                        B       .
                         ENDP
 
 SVC_Handler             PROC
                         EXPORT SVC_Handler              [WEAK]
-                        B       SVC_Handler
+                        B       .
                         ENDP
 
 DebugMon_Handler        PROC
                         EXPORT DebugMon_Handler         [WEAK]
-                        B       DebugMon_Handler
+                        B       .
                         ENDP
 
 PendSV_Handler          PROC
                         EXPORT PendSV_Handler           [WEAK]
-                        B       PendSV_Handler
+                        B       .
                         ENDP
 
 SysTick_Handler         PROC
                         EXPORT SysTick_Handler          [WEAK]
-                        B       SysTick_Handler
+                        B       .
                         ENDP
 
 Default_Handler         PROC

targets/TARGET_Maxim/TARGET_MAX32630/device/TOOLCHAIN_ARM_STD/startup_MAX3263x.S

@@ -138,47 +138,47 @@ __SPIN
 
 NMI_Handler             PROC
                         EXPORT NMI_Handler              [WEAK]     
-                        B       NMI_Handler
+                        B       .
                         ENDP
 
 HardFault_Handler       PROC
                         EXPORT HardFault_Handler        [WEAK]             
-                        B       HardFault_Handler
+                        B       .
                         ENDP
 
 MemManage_Handler       PROC
                         EXPORT MemManage_Handler        [WEAK]
-                        B       MemManage_Handler
+                        B       .
                         ENDP
 
 BusFault_Handler        PROC
                         EXPORT BusFault_Handler         [WEAK]
-                        B       BusFault_Handler
+                        B       .
                         ENDP
 
 UsageFault_Handler      PROC
                         EXPORT UsageFault_Handler       [WEAK]
-                        B       UsageFault_Handler
+                        B       .
                         ENDP
 
 SVC_Handler             PROC
                         EXPORT SVC_Handler              [WEAK]
-                        B       SVC_Handler
+                        B       .
                         ENDP
 
 DebugMon_Handler        PROC
                         EXPORT DebugMon_Handler         [WEAK]
-                        B       DebugMon_Handler
+                        B       .
                         ENDP
 
 PendSV_Handler          PROC
                         EXPORT PendSV_Handler           [WEAK]
-                        B       PendSV_Handler
+                        B       .
                         ENDP
 
 SysTick_Handler         PROC
                         EXPORT SysTick_Handler          [WEAK]
-                        B       SysTick_Handler
+                        B       .
                         ENDP
 
 Default_Handler         PROC