staging: brcm80211: remove locking macro definitions

The driver contained locking macros which map directly to the
lock function provided by the kernel. It does not provide any
additional value so these have been removed.
Reported-by: Johannes Berg <johannes@sipsolutions.net>
Reviewed-by: Roland Vossen <rvossen@broadcom.com>
Reviewed-by: Alwin Beukers <alwin@broadcom.com>
Signed-off-by: Arend van Spriel <arend@broadcom.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>