brcm80211: moved function brcmu_parse_tlvs

Moved the brcmu_parse_tlvs function and brcmu_tlv structure into
the only file using them. Names were adjusted accordingly.

Reported-by: Johannes Berg <johannes@sipsolutions.net>
Reviewed-by: Roland Vossen <rvossen@broadcom.com>
Reviewed-by: Arend van Spriel <arend@broadcom.com>
Signed-off-by: Arend van Spriel <arend@broadcom.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>