fix(plat/rcar): fix to load image when option BL2_DCACHE_ENABLE is enabled

- Modify load destination variable of the Cert Header to static.
- Modify the return value to error (IO_FAIL) when failed to check
  the Cert Header.

Signed-off-by: Koichi Yamaguchi <koichi.yamaguchi.zb@hitachi.com>
Signed-off-by: Toshiyuki Ogasahara <toshiyuki.ogasahara.bo@hitachi.com>
Signed-off-by: Yoshifumi Hosoya <yoshifumi.hosoya.wj@renesas.com>
Change-Id: Ief09a841ec8d2ae236de82d04855e6a47cfb43f0

drivers/renesas/common/io/io_rcar.c

@@ -380,7 +380,7 @@ static int32_t load_bl33x(void)
 
 static int32_t rcar_dev_init(io_dev_info_t *dev_info, const uintptr_t name)
 {
-	uint64_t header[64] __aligned(FLASH_TRANS_SIZE_UNIT) = {0UL};
+	static uint64_t header[64] __aligned(FLASH_TRANS_SIZE_UNIT) = {0UL};
 	uintptr_t handle;
 	ssize_t offset;
 	uint32_t i;
@@ -440,6 +440,7 @@ static int32_t rcar_dev_init(io_dev_info_t *dev_info, const uintptr_t name)
 
 	if (rcar_image_number == 0 || rcar_image_number > RCAR_MAX_BL3X_IMAGE) {
 		WARN("Firmware Image Package header check failed.\n");
+		rc = IO_FAIL;
 		goto error;
 	}