mac80211: remove useless patch

This patch was already applied upstream, linux/device.h gets included 2
lines above this change.

This was done in this commit:
https://git.kernel.org/cgit/linux/kernel/git/backports/backports.git/commit/?id=fd6bb301116d48c50722b0a4399e26ab0237e563



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


git-svn-id: svn://svn.openwrt.org/openwrt/trunk@46202 3c298f89-4303-0410-b956-a3cf2f4a3e73