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/linkstation.h b/include/configs/linkstation.h
index bc64294..e5a0fb9 100644
--- a/include/configs/linkstation.h
+++ b/include/configs/linkstation.h
@@ -434,7 +434,7 @@
  * 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	*/
 
 #undef  CFG_FLASH_PROTECTION
 #define CFG_FLASH_BANKS_LIST	{ CFG_FLASH_BASE }