wifi: iwlwifi: don't spam logs with NSS>2 messages

I get a log line like this every 4 seconds when connected to my AP:

[15650.221468] iwlwifi 0000:09:00.0: Got NSS = 4 - trimming to 2

Looking at the code, this seems to be related to a hardware limitation,
and there's nothing to be done. In an effort to keep my dmesg
manageable, downgrade this error to "debug" rather than "info".

Cc: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
Signed-off-by: Kalle Valo <kvalo@kernel.org>
Link: https://lore.kernel.org/r/20220905172246.105383-1-Jason@zx2c4.com

drivers/net/wireless/intel/iwlwifi/mvm/mac80211.c

@@ -1833,8 +1833,8 @@ static void iwl_mvm_parse_ppe(struct iwl_mvm *mvm,
 	* If nss < MAX: we can set zeros in other streams
 	*/
 	if (nss > MAX_HE_SUPP_NSS) {
-		IWL_INFO(mvm, "Got NSS = %d - trimming to %d\n", nss,
-			 MAX_HE_SUPP_NSS);
+		IWL_DEBUG_INFO(mvm, "Got NSS = %d - trimming to %d\n", nss,
+			       MAX_HE_SUPP_NSS);
 		nss = MAX_HE_SUPP_NSS;
 	}