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/p3p440.h b/include/configs/p3p440.h
index 82f2391..ac0d83a 100644
--- a/include/configs/p3p440.h
+++ b/include/configs/p3p440.h
@@ -279,7 +279,7 @@
  * FLASH related
  *----------------------------------------------------------------------*/
 #define CFG_FLASH_CFI				/* The flash is CFI compatible	*/
-#define CFG_FLASH_CFI_DRIVER			/* Use common CFI driver	*/
+#define CONFIG_FLASH_CFI_DRIVER			/* Use common CFI driver	*/
 
 #define CFG_FLASH_BANKS_LIST { CFG_FLASH3, CFG_FLASH2, CFG_FLASH1, CFG_FLASH0 }