wifi: iwlwifi: mvm: advertise 320 MHz in 6 GHz only conditionally

We can't have it in AP mode unless for debug, since we don't have
160 MHz in HE PHY capabilities, and also set it only in 6 GHz even
if (unlike in HE) it's always defined.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Link: https://lore.kernel.org/r/20221122220713.293ef3e5a1c4.I867526a6bd3f93ee50076ff359436dfb5ec6101c@changeid


Signed-off-by: Gregory Greenman <gregory.greenman@intel.com>