staging: brcm80211: removed ASSERTs from wlc_main.c

Driver contains far too many ASSERTs. Functions that were only used
from within removed ASSERTs have also been deleted, such as
wlc_bmac_taclear() in wlc_bmac.c.

Cc: devel@linuxdriverproject.org
Cc: linux-wireless@vger.kernel.org
Cc: Brett Rudley <brudley@broadcom.com>
Cc: Henry Ptasinski <henryp@broadcom.com>
Cc: Roland Vossen <rvossen@broadcom.com>
Signed-off-by: Arend van Spriel <arend@broadcom.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>