Import code update from iwlwifi-next
at e89600ebeeb14d18c0b062837a84196f72542830.
This amongst other things removes the deprecated BCAST_FILTERING option,
which we had disabled before due to firmware issues.
Also prepares us for the next firmware update.
The "enable_ini" module option has become an integer with a
sysctl proc equivalent handler. Disable the module parameter changing
for the moment until we'll have working LinuxKPI support or implement
it as SYSCTL_PROC in FreeBSD directly.
Sponsored by: The FreeBSD Foundation
MFC after: 3 days
fac1f59384