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/M5485EVB.h b/include/configs/M5485EVB.h
index 0f957ff..a14c55b 100644
--- a/include/configs/M5485EVB.h
+++ b/include/configs/M5485EVB.h
@@ -245,7 +245,7 @@
 #define CFG_FLASH_CFI
 #ifdef CFG_FLASH_CFI
 #	define CFG_FLASH_BASE		(CFG_CS0_BASE)
-#	define CFG_FLASH_CFI_DRIVER	1
+#	define CONFIG_FLASH_CFI_DRIVER	1
 #	define CFG_FLASH_CFI_WIDTH	FLASH_CFI_16BIT
 #	define CFG_MAX_FLASH_SECT	137	/* max number of sectors on one chip */
 #	define CFG_FLASH_PROTECTION	/* "Real" (hardware) sectors protection */