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/grsim_leon2.h b/include/configs/grsim_leon2.h
index 406ce3d..e5af9a6 100644
--- a/include/configs/grsim_leon2.h
+++ b/include/configs/grsim_leon2.h
@@ -199,7 +199,7 @@
 
 /*** CFI CONFIG ***/
 #define CFG_FLASH_CFI_WIDTH	FLASH_CFI_8BIT
-#define CFG_FLASH_CFI_DRIVER
+#define CONFIG_FLASH_CFI_DRIVER
 #define CFG_FLASH_CFI
 #endif