k64f: change flash device name
Recent Zephyr changes the flash device name. Change to match it.
diff --git a/boot/zephyr/targets/frdm_k64f.h b/boot/zephyr/targets/frdm_k64f.h
index 01926d5..590b1cb 100644
--- a/boot/zephyr/targets/frdm_k64f.h
+++ b/boot/zephyr/targets/frdm_k64f.h
@@ -19,7 +19,7 @@
* @brief Bootloader device specific configuration.
*/
-#define FLASH_DRIVER_NAME "KSDK_FLASH"
+#define FLASH_DRIVER_NAME "MCUX_FLASH"
#define FLASH_ALIGN 8
#define FLASH_AREA_IMAGE_0_OFFSET 0x20000
#define FLASH_AREA_IMAGE_0_SIZE 0x20000