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/atngw100.h b/include/configs/atngw100.h
index f040b86..6d8c1b2 100644
--- a/include/configs/atngw100.h
+++ b/include/configs/atngw100.h
@@ -140,7 +140,7 @@
 #define CONFIG_NR_DRAM_BANKS		1
 
 #define CFG_FLASH_CFI			1
-#define CFG_FLASH_CFI_DRIVER		1
+#define CONFIG_FLASH_CFI_DRIVER		1
 
 #define CFG_FLASH_BASE			0x00000000
 #define CFG_FLASH_SIZE			0x800000