Add the process for Cortex-A in mbed_applicaion

I added the process for Cortex-A in mbed_application.c because this process was for only Cortex-M.
Also I enabled the macro of MBED_APPLICATION_SUPPORT for Cortex-A.

Author: TomoYamanaka

platform/mbed_application.c

@@ -21,6 +21,15 @@
 
 #if MBED_APPLICATION_SUPPORT
 
+#if defined(__CORTEX_A9)
+
+void mbed_start_application(uintptr_t address)
+{
+    ((void(*)())address)();
+}
+
+#else
+
 static void powerdown_nvic(void);
 static void powerdown_scb(uint32_t vtor);
 static void start_new_application(void *sp, void *pc);
@@ -144,4 +153,6 @@ void start_new_application(void *sp, void *pc)
 
 #endif
 
+#endif
+
 #endif /* MBED_APPLICATION_SUPPORT */

platform/mbed_application.h

@@ -20,7 +20,7 @@
 #include<stdint.h>
 
 #if defined(__CORTEX_M3) || defined(__CORTEX_M4) || defined(__CORTEX_M7)\
-    || defined(__CORTEX_M23)
+    || defined(__CORTEX_M23) || defined(__CORTEX_A9)
 #define MBED_APPLICATION_SUPPORT 1
 #else
 #define MBED_APPLICATION_SUPPORT 0