mwifiex: remove unsupported code in 11ac

bit12 in fw_cap_info is for testing only.
Remove all related code.

Signed-off-by: Bing Zhao <bzhao@marvell.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

diff --cc drivers/net/wireless/mwifiex/cfg80211.c
Simple merge

diff --cc drivers/net/wireless/mwifiex/cfp.c
Simple merge

diff --cc drivers/net/wireless/mwifiex/fw.h
Simple merge

diff --cc drivers/net/wireless/mwifiex/ioctl.h
Simple merge

diff --cc drivers/net/wireless/mwifiex/join.c
Simple merge

diff --cc drivers/net/wireless/mwifiex/sta_ioctl.c
Simple merge