RZ_A1H: Fix cmsis header name

Author: bulislaw

targets/TARGET_RENESAS/TARGET_RZ_A1H/device/MBRZA1H.h

@@ -626,7 +626,7 @@ typedef enum IRQn
 #define __NVIC_PRIO_BITS          5         /*!< Number of Bits used for Priority Levels          */
 #define __Vendor_SysTickConfig    0         /*!< Set to 1 if different SysTick Config is used     */
 
-#include <core_ca9.h>
+#include <core_ca.h>
 #include "system_MBRZA1H.h"