ath5k: Move mac80211 functions into new file

Move mac80211 functions into new file mac80211-ops.c to have a better
separation and to make base.c smaller.

Signed-off-by: Bruno Randolf <br1@einfach.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

diff --cc drivers/net/wireless/ath/ath5k/Makefile
Simple merge

diff --cc drivers/net/wireless/ath/ath5k/base.c
Simple merge

diff --cc drivers/net/wireless/ath/ath5k/mac80211-ops.c
Simple merge