mac80211: do not download carl9170 firmware separately, but use the one from linux-firemware

linux-firemware contains the same version we loaded without this patch.

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


git-svn-id: svn://svn.openwrt.org/openwrt@37901 3c298f89-4303-0410-b956-a3cf2f4a3e73