kernel: add kmod-lp again

This was deactivated in r21954 because it depended on kernel 2.4, but 
this module also compiles with kernel 3.18.

This closes #20199.

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>


git-svn-id: svn://svn.openwrt.org/openwrt/trunk@46495 3c298f89-4303-0410-b956-a3cf2f4a3e73