drivers/mtd: Move conditional compilation to Makefile

rename CFG_FLASH_CFI_DRIVER to CONFIG_FLASH_CFI_DRIVER

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
diff --git a/include/configs/mcu25.h b/include/configs/mcu25.h
index 4e9645e..6adba96 100644
--- a/include/configs/mcu25.h
+++ b/include/configs/mcu25.h
@@ -105,7 +105,7 @@
 
 /* Use common CFI driver */
 #define CFG_FLASH_CFI
-#define CFG_FLASH_CFI_DRIVER
+#define CONFIG_FLASH_CFI_DRIVER
 /* board provides its own flash_init code */
 #define CONFIG_FLASH_CFI_LEGACY		1
 #define CFG_FLASH_CFI_WIDTH		FLASH_CFI_8BIT