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/mx31ads.h b/include/configs/mx31ads.h
index 37ba872..9ede764 100644
--- a/include/configs/mx31ads.h
+++ b/include/configs/mx31ads.h
@@ -185,7 +185,7 @@
  * CFI FLASH driver setup
  */
 #define CFG_FLASH_CFI			1 /* Flash memory is CFI compliant */
-#define CFG_FLASH_CFI_DRIVER		1 /* Use drivers/cfi_flash.c */
+#define CONFIG_FLASH_CFI_DRIVER		1 /* Use drivers/cfi_flash.c */
 #define CONFIG_FLASH_SPANSION_S29WS_N	1 /* A non-standard buffered write algorithm */
 #define CFG_FLASH_USE_BUFFER_WRITE	1 /* Use buffered writes (~10x faster) */
 #define CFG_FLASH_PROTECTION		1 /* Use hardware sector protection */