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/actux4.h b/include/configs/actux4.h
index e4dca2a..7f8e0f4 100644
--- a/include/configs/actux4.h
+++ b/include/configs/actux4.h
@@ -134,7 +134,7 @@
 
 /* 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
 /* no byte writes on IXP4xx */