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/ads5121.h b/include/configs/ads5121.h
index 091da80..d129ea3 100644
--- a/include/configs/ads5121.h
+++ b/include/configs/ads5121.h
@@ -183,7 +183,7 @@
  */
 #undef CONFIG_BKUP_FLASH
 #define CFG_FLASH_CFI				/* use the Common Flash Interface */
-#define CFG_FLASH_CFI_DRIVER			/* use the CFI driver */
+#define CONFIG_FLASH_CFI_DRIVER			/* use the CFI driver */
 #ifdef CONFIG_BKUP_FLASH
 #define CFG_FLASH_BASE		0xFF800000	/* start of FLASH   */
 #define CFG_FLASH_SIZE		0x00800000	/* max flash size in bytes */