x86: add back a line accidentally removed in r41763

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@41764 3c298f89-4303-0410-b956-a3cf2f4a3e73

config/Config-images.in

@@ -235,6 +235,7 @@ menu "Target Images"
 	config VMDK_IMAGES
 		bool "Build VMware image files (VMDK)"
 		depends on TARGET_x86 || TARGET_x86_64
+		select GRUB_IMAGES
 		select TARGET_IMAGES_PAD
 		select PACKAGE_kmod-e1000