PSOC6_FUTURE: Fix circular dependency for GPIO-IRQ

After adding a default implementation of gpio_irq_pinmap() in
hal/mbed_gpio_irq.c, a circular dependency was found:

hal/mbed_gpio_irq.c includes
hal/gpio_irq_api.h, which includes
targets/TARGET_Cypress/TARGET_PSOC6_FUTURE/TARGET_CY8C63XX/device.h, which includes
targets/TARGET_Cypress/TARGET_PSOC6_FUTURE/objects.h, which includes
hal/gpio_irq_api.h AGAIN.

Remove `#include "gpio_irq_api.h"` directive from objects.h and change
the types of `gpio_irq_s` members.

Author: Filip Jagodzinski

targets/TARGET_Cypress/TARGET_PSOC6_FUTURE/gpio_irq_api.c

@@ -49,7 +49,7 @@ static void gpio_irq_dispatcher(uint32_t port_id)
             MBED_ASSERT(obj);
             Cy_GPIO_ClearInterrupt(port, pin);
             event = (obj->mode == IRQ_FALL)? IRQ_FALL : IRQ_RISE;
-            obj->handler(obj->id_arg, event);
+            ((gpio_irq_handler) obj->handler)(obj->id_arg, event);
         }
     }
 }
@@ -202,7 +202,7 @@ int gpio_irq_init(gpio_irq_t *obj, PinName pin, gpio_irq_handler handler, uint32
             MBED_ASSERT("Invalid pin ID!");
             return (-1);
         }
-        obj->handler = handler;
+        obj->handler = (uint32_t) handler;
         obj->id_arg = id;
         return gpio_irq_setup_channel(obj);
     } else {

targets/TARGET_Cypress/TARGET_PSOC6_FUTURE/objects.h

@@ -23,7 +23,6 @@
 #include "PinNames.h"
 #include "PortNames.h"
 
-#include "gpio_irq_api.h"
 #include "gpio_object.h"
 #include "cy_sysclk.h"
 #include "cy_syspm.h"
@@ -37,8 +36,8 @@ struct gpio_irq_s {
     GPIO_PRT_Type*      port;
     uint32_t            port_id;
     uint32_t            pin;
-    gpio_irq_event      mode;
-    gpio_irq_handler    handler;
+    uint32_t            mode;
+    uint32_t            handler;
     uint32_t            id_arg;
 #if defined (TARGET_MCU_PSOC6_M0)
     cy_en_intr_t        cm0p_irq_src;