wifi: iwlwifi: mvm: Add basic link selection logic

wifi: iwlwifi: mvm: Add basic link selection logic

Add simple logic that would allow using EMLSR in case
there are multiple valid links:

- In case the connection establishment has just been
  completed try to find a valid link pair for EMLSR
  functionality where one of the links in the pair is
  the current active link.
- In case the valid links changed after connection
  was already established, try to find a valid link pair
  for EMLSR functionality, in case the EMSLR is not active
  yet.

If a valid link pair is found call mac80211 to asynchronously
set the new link pair, otherwise continue using the current active
links.

Signed-off-by: Ilan Peer <ilan.peer@intel.com>
Signed-off-by: Gregory Greenman <gregory.greenman@intel.com>
Link: https://lore.kernel.org/r/20231004123422.0c7b89ab29c2.I6600bd16551d75e2bf520d8d0add525568a9f85f@changeid
Signed-off-by: Johannes Berg <johannes.berg@intel.com>