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/cm5200.h b/include/configs/cm5200.h
index ef50c7c..0221dfe 100644
--- a/include/configs/cm5200.h
+++ b/include/configs/cm5200.h
@@ -177,7 +177,7 @@
  * Flash configuration
  */
 #define CFG_FLASH_CFI		1
-#define CFG_FLASH_CFI_DRIVER	1
+#define CONFIG_FLASH_CFI_DRIVER	1
 #define CFG_FLASH_BASE		0xfc000000
 /* we need these despite using CFI */
 #define CFG_MAX_FLASH_BANKS	1	/* max num of flash banks */