qcacld-3.0: dp: Replace fallthrough comment with attribute

-Wimplicit-fallthrough is being enabled by default. Some compilers
such as clang require the attribute instead of just a fallthrough comment.

Change-Id: I6d12321a649b61b35f9abf4fb977d368fc8a6e4e
CRs-Fixed: 3217402

components/dp/core/src/wlan_dp_main.c

@@ -313,16 +313,16 @@ void dp_trace_init(struct wlan_objmgr_psoc *psoc)
 	switch (num_entries) {
 	case 4:
 		proto_bitmap = config_params[3];
-		/* fallthrough */
+		fallthrough;
 	case 3:
 		verbosity = config_params[2];
-		/* fallthrough */
+		fallthrough;
 	case 2:
 		thresh = config_params[1];
-		/* fallthrough */
+		fallthrough;
 	case 1:
 		live_mode = config_params[0];
-		/* fallthrough */
+		fallthrough;
 	default:
 		dp_debug("live_mode %u thresh %u time_limit %u verbosity %u bitmap 0x%x",
 			 live_mode, thresh, thresh_time_limit,

components/dp/core/src/wlan_dp_softap_txrx.c

@@ -330,7 +330,7 @@ int dp_softap_inspect_dhcp_packet(struct wlan_dp_intf *dp_intf,
 						sta_info->sta_mac.bytes,
 						true);
 			sta_info->dhcp_nego_status = DHCP_NEGO_IN_PROGRESS;
-			/* fallthrough */
+			fallthrough;
 		case QDF_PROTO_DHCP_DECLINE:
 			if (dir == QDF_RX)
 				sta_info->dhcp_phase = DHCP_PHASE_REQUEST;