staging: brcm80211: updated TODO file

The only remaining TODO item has been tackled so it was removed. No
other TODO items left.

Reviewed-by: Roland Vossen <rvossen@broadcom.com>
Reviewed-by: Pieter-Paul Giesberts <pieterpg@broadcom.com>
Signed-off-by: Arend van Spriel <arend@broadcom.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/staging/brcm80211/TODO

@@ -4,10 +4,6 @@ Bugs
 ====
 - none known at this moment
 
-brcmfmac
-=====================
-- ASSERTS deprecated in mainline, replace by warning + error handling
-
 brcm80211 info page
 =====================
 http://linuxwireless.org/en/users/Drivers/brcm80211