wifi: iwlwifi: mvm: Return success if link could not be removed

iwl_mvm_remove_link would return an error if the link could not be
removed. However, doing so prevents recovery if a link was not uploaded
to the FW in the first place and the link_info was not allocated or
fw_link_id is not set.

Returning success means that we can still try to continue with adding
new links in change_vif_links.

Signed-off-by: Benjamin Berg <benjamin.berg@intel.com>
Signed-off-by: Gregory Greenman <gregory.greenman@intel.com>
Link: https://lore.kernel.org/r/20231017115047.f89bc05aadf6.Idc8fbd671362d962c02b1df87fa6258733631580@changeid
Signed-off-by: Johannes Berg <johannes.berg@intel.com>