wifi: iwlwifi: unify cmd_queue_full() into nic_error()

wifi: iwlwifi: unify cmd_queue_full() into nic_error()

Except for some special handling in DVM, error dump and some
message behaviour, cmd_queue_full and nic_error are equivalent
now. Unify by giving a special error type, so DVM can continue
to differentiate.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Miri Korenblit <miriam.rachel.korenblit@intel.com>
Link: https://patch.msgid.link/20241227095718.0222183504aa.Ie29cef75fbd91b64a43619bc36bd5b29c5b9f957@changeid
Signed-off-by: Johannes Berg <johannes.berg@intel.com>