wifi: iwlwifi: get the max number of links from the firmware

The firmware advertises the maximum number of links.
Use it.

Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Reviewed-by: Miriam Rachel Korenblit <miriam.rachel.korenblit@intel.com>
Link: https://patch.msgid.link/20241231135726.5eb29510f2b4.I7f35f61987c2ee905960ee476df6803632b0feb8@changeid


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