x86: remove the arbitrary limitation of vmware/virtualbox images to ext4, select TARGET_IMAGES_PAD instead

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

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@41763 3c298f89-4303-0410-b956-a3cf2f4a3e73
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