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/uc100.h b/include/configs/uc100.h
index e74b1bb..106e6f2 100644
--- a/include/configs/uc100.h
+++ b/include/configs/uc100.h
@@ -230,7 +230,7 @@
  * FLASH organization
  */
 #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_CFI_AMD_RESET	1		/* AMD RESET for STM 29W320DB!  */
 
 #define CFG_MAX_FLASH_BANKS	1	/* max number of memory banks		*/