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/ATUM8548.h b/include/configs/ATUM8548.h
index f05c1d5..6aa881c 100644
--- a/include/configs/ATUM8548.h
+++ b/include/configs/ATUM8548.h
@@ -182,7 +182,7 @@
 
 #define CFG_MONITOR_BASE	TEXT_BASE	/* start of monitor */
 
-#define CFG_FLASH_CFI_DRIVER    1
+#define CONFIG_FLASH_CFI_DRIVER    1
 #define CFG_FLASH_CFI           1
 #define CFG_FLASH_EMPTY_INFO