staging: brcm80211: changed module wlc_mac80211 to wlc_main

The source and include file for the wlc_mac80211 module has been
renamed to wlc_main and subsequently the include statement in
other source files. This module provides the main interface towards
wl_mac80211 module.

Reviewed-by: Roland Vossen <rvossen@broadcom.com>
Reviewed-by: Brett Rudley <brudley@broadcom.com>
Signed-off-by: Arend van Spriel <arend@broadcom.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>