CONFIG_BLK_DEV does not activate any functionality, but many code, but
makes it possible to activate other options. Deactivating this breaks
the build of kmod-zram.
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@42528 3c298f89-4303-0410-b956-a3cf2f4a3e73