package: kernel: make crypto kmods always visible

Don't hide crypo submodules unless crypo-core is selected.

Fixes kmods depending on crypto modules being unselectable
until crypto core is selected (like ext4 on 3.6 or mac80211).

Signed-off-by: Jonas Gorski <jonas.gorski@gmail.com>
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@34298 3c298f89-4303-0410-b956-a3cf2f4a3e73