x86/build: Drop unused mflags-y

Subarchitecture support (mflags-y) was removed from x86 in this commit:

   6bda2c8 ("x86: remove subarchitecture support")

So drop the mflags-y usage from the Makefile.

Signed-off-by: Cao jin <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Ingo Molnar <[email protected]>

Author: Cao jin

arch/x86/Makefile

@@ -232,9 +232,6 @@ KBUILD_CFLAGS += -Wno-sign-compare
 #
 KBUILD_CFLAGS += -fno-asynchronous-unwind-tables
 
-KBUILD_CFLAGS += $(mflags-y)
-KBUILD_AFLAGS += $(mflags-y)
-
 archscripts: scripts_basic
 	$(Q)$(MAKE) $(build)=arch/x86/tools relocs