sched: Lower log level of RTS on disabled pdch

These messages are expected under some circumstances, such as when
direct phy is used and a chan is disabled (eg. dyn TS). This happens
because PCU asks for chan de-activation through PCUIF while at the same
time marking the PDCH locally as disabled. Hence, in the time the BTS
manages to disable it on the lower layers, the phy still sends us
RTS indications.

Let's keep it under NOTICE to avoid clogging the logs in production
setups which are usually using global level of NOTICE or ERROR.

Related: OS#5222
Change-Id: Iab9e1590b504bf05dc693e27550b30db0dffcbc7

src/gprs_rlcmac_sched.cpp

@@ -421,7 +421,7 @@ int gprs_rlcmac_rcv_rts_block(struct gprs_rlcmac_bts *bts,
 	pdch = &bts->trx[trx].pdch[ts];
 
 	if (!pdch->is_enabled()) {
-		LOGPDCH(pdch, DRLCMACSCHED, LOGL_ERROR, "Received RTS on disabled TS\n");
+		LOGPDCH(pdch, DRLCMACSCHED, LOGL_INFO, "Received RTS on disabled TS\n");
 		return -EIO;
 	}