wifi: iwlwifi: mvm: allow number of beacons from FW

Newer firmware images have a TLV advertising how many
beacons they support, use that to permit adding more
links in AP mode (FW needs to support at least as many
links as beacons).

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Gregory Greenman <gregory.greenman@intel.com>
Link: https://lore.kernel.org/r/20230416154301.0d7522533557.Ic6b5992e94446c35cb0f3add019defa6e7aded2a@changeid


Signed-off-by: Johannes Berg <johannes.berg@intel.com>