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/SX1.h b/include/configs/SX1.h
index 50ad7dd..d233679 100644
--- a/include/configs/SX1.h
+++ b/include/configs/SX1.h
@@ -181,7 +181,7 @@
  * FLASH driver setup
  */
 #define CFG_FLASH_CFI		1	/* Flash memory is CFI compliant */
-#define CFG_FLASH_CFI_DRIVER	1	/* Use drivers/mtd/cfi_flash.c */
+#define CONFIG_FLASH_CFI_DRIVER	1	/* Use drivers/mtd/cfi_flash.c */
 #define CFG_FLASH_USE_BUFFER_WRITE 1	/* Use buffered writes (~10x faster) */
 #define CFG_FLASH_PROTECTION	1	/* Use hardware sector protection */