qcacld-3.0: Modify band_mask in cm_roam_scan_info_event

In api cm_roam_scan_info_event(), band_mask is updated
for ROAM_STATS_SCAN_TYPE_HIGHER_BAND_6GHZ and
ROAM_STATS_SCAN_TYPE_HIGHER_BAND_5GHZ_6GHZ. But
the band mask is truncated for ROAM_STATS_SCAN_TYPE_FULL.

add check in api cm_roam_scan_info_event() to update
band mask only for scan type
ROAM_STATS_SCAN_TYPE_HIGHER_BAND_6GHZ and
ROAM_STATS_SCAN_TYPE_HIGHER_BAND_5GHZ_6GHZ in order
to prevent the band mask from truncating for
ROAM_STATS_SCAN_TYPE_FULL.

Change-Id: I3e85c87e3e304d0c4d4ae311c7be1939e73d05df
CRs-Fixed: 3666578

components/umac/mlme/connection_mgr/core/src/wlan_cm_roam_offload.c

@@ -6297,7 +6297,8 @@ void cm_roam_scan_info_event(struct wlan_objmgr_psoc *psoc,
 			 ROAM_STATS_SCAN_TYPE_HIGHER_BAND_5GHZ_6GHZ)
 			scan_band_mask = BIT(REG_BAND_5G) | BIT(REG_BAND_6G);
 
-		band_mask &= scan_band_mask;
+		if (scan_band_mask)
+			band_mask &= scan_band_mask;
 
 		for (i = 0; i < num_chan; i++) {
 			if (!wlan_is_valid_frequency(chan_freq[i],