Update K64F linker files for general solution of 2-ram regions

Author: Deepika

targets/TARGET_Freescale/TARGET_MCUXpresso_MCUS/TARGET_MCU_K64F/device/TOOLCHAIN_ARM_STD/sys.cpp

@@ -89,16 +89,13 @@
 
 #ifndef INITIAL_SP
 #define INITIAL_SP              (0x20030000UL)
-#if defined(__CC_ARM) || (defined(__ARMCC_VERSION) && (__ARMCC_VERSION >= 6010050))
+#endif
+
+#if defined(__ARMCC_VERSION)
 extern uint32_t               Image$$ARM_LIB_HEAP$$ZI$$Base[];
 extern uint32_t               Image$$ARM_LIB_HEAP$$ZI$$Length[];
-extern uint32_t               Image$$ARM_LIB_STACK$$ZI$$Base[];
-extern uint32_t               Image$$ARM_LIB_STACK$$ZI$$Length[];
-#define HEAP_START            ((unsigned char*) Image$$ARM_LIB_HEAP$$ZI$$Base)
-#define HEAP_SIZE             ((uint32_t) Image$$ARM_LIB_HEAP$$ZI$$Length)
-#define ISR_STACK_START       ((unsigned char*)Image$$ARM_LIB_STACK$$ZI$$Base)
-#define ISR_STACK_SIZE        ((uint32_t)Image$$ARM_LIB_STACK$$ZI$$Length)
-#endif
+#define HEAP_START            Image$$ARM_LIB_HEAP$$ZI$$Base
+#define HEAP_SIZE             Image$$ARM_LIB_HEAP$$ZI$$Length
 #endif
 
 #elif defined(TARGET_SDT64B)