qcacmn: Reset the master_list[].chan_flags

Currently, the chan_flags in master_list does not reset.
So when changing the country code, the previous counry
code's chan flag will pollute the current country code's.

Change-Id: Idb7bbb2a216a8d756ddcfd2edb090807f098fadf
CRs-Fixed: 2199920

umac/regulatory/core/src/reg_services.c

@@ -2762,7 +2762,7 @@ QDF_STATUS reg_process_master_chan_list(struct cur_regulatory_info
 			channel_map[chan_enum].chan_num;
 		mas_chan_list[chan_enum].center_freq =
 			channel_map[chan_enum].center_freq;
-		mas_chan_list[chan_enum].chan_flags |=
+		mas_chan_list[chan_enum].chan_flags =
 			REGULATORY_CHAN_DISABLED;
 		mas_chan_list[chan_enum].state =
 			CHANNEL_STATE_DISABLE;