always use .defconfig, otherwise make menuconfig and ADK_APPLIANCE does not work

mk/build.mk

@@ -458,9 +458,7 @@ endif
 			|sed -e "s#^config \(.*\)#\1=y#" \
 			>> $(ADK_TOPDIR)/.defconfig; \
 	fi
-	@if [ ! -z "$(ADK_APPLIANCE)" ];then \
-		$(CONFIG)/conf --defconfig=.defconfig $(CONFIG_CONFIG_IN); \
-	fi
+	@$(CONFIG)/conf --defconfig=.defconfig $(CONFIG_CONFIG_IN)
 
 allconfig:
 ifeq (${OStype},Linux)