wifi: iwlwifi: mvm: enable FILS DF Tx on non-PSC channel

If the channel bandwidth is greater or equal than 80MHz,
enable FILS DF transmittion, even if the control channel is non-PSC.
That's because that in 80MHz there must be a sub 20MHz PSC
channel, and since the FILS DF is duplicated on all sub 20MHz
channels, within the 80MHz (hence it will be sent on a PSC channel).

Also, if FILS DF Tx is enabled, always configure the firmware
with the actual channel bandwidth, even before there is a connected
client (rather than the minimum bandwidth e.g. 20MHz), since FILS
DF transmission on a PSC channel take presedent over power
consumption.

Signed-off-by: Shaul Triebitz <shaul.triebitz@intel.com>
Signed-off-by: Gregory Greenman <gregory.greenman@intel.com>
Link: https://lore.kernel.org/r/20230913145231.83b9a76fc6c4.I6703111cc6befcd0e9cd9adf3cb127a648dbb7b1@changeid
Signed-off-by: Johannes Berg <johannes.berg@intel.com>