[bsp][hc32]support MDK AC6 compiler (#6087)

bsp/hc32/ev_hc32f460_lqfp100_v2/board/board.h

@@ -23,7 +23,7 @@ extern "C" {
 #define HC32_SRAM_SIZE                  (188)
 #define HC32_SRAM_END                   (0x1FFF8000 + HC32_SRAM_SIZE * 1024)
 
-#ifdef __CC_ARM
+#ifdef __ARMCC_VERSION
 extern int Image$$RW_IRAM1$$ZI$$Limit;
 #define HEAP_BEGIN                      (&Image$$RW_IRAM1$$ZI$$Limit)
 #elif __ICCARM__

bsp/hc32/ev_hc32f4a0_lqfp176/board/board.h

@@ -23,7 +23,7 @@ extern "C" {
 #define HC32_SRAM_SIZE                  (512)
 #define HC32_SRAM_END                   (0x1FFE0000 + HC32_SRAM_SIZE * 1024)
 
-#ifdef __CC_ARM
+#ifdef __ARMCC_VERSION
 extern int Image$$RW_IRAM1$$ZI$$Limit;
 #define HEAP_BEGIN                      (&Image$$RW_IRAM1$$ZI$$Limit)
 #elif __ICCARM__