mac80211: Enable kmod-rt2800-soc package for rt288x target

Trunk and the latest backport to Attitude Adjustment have the
kmod-rt2800-soc package hidden for the ramips_rt288x target.
This makes the dependency match the dependency given in the
TITLE field.

Signed-off-by: Claudio Leite <leitec@staticky.com>
Backport of r39976

git-svn-id: svn://svn.openwrt.org/openwrt/branches/attitude_adjustment@40354 3c298f89-4303-0410-b956-a3cf2f4a3e73