cfg80211: make connect ie param const

This required liberally sprinkling 'const' over brcmfmac
and mwifiex but seems like a useful thing to do since the
pointer can't really be written.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>

diff --cc drivers/net/wireless/brcm80211/brcmfmac/fwil.c
Simple merge

diff --cc drivers/net/wireless/brcm80211/brcmfmac/fwil.h
Simple merge

diff --cc drivers/net/wireless/brcm80211/brcmfmac/wl_cfg80211.c
Simple merge

diff --cc drivers/net/wireless/brcm80211/brcmfmac/wl_cfg80211.h
Simple merge

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

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

diff --cc include/net/cfg80211.h
Simple merge