qcacld-3.0: Enable DFS channel for a single channel scan

In csr_scan_copy_request_valid_channels_only(), the DFS channels
are ignored if ini parameter gSkipDfsChannelInP2pSearch is enabled.
If the supplicant issues a single channel scan for a DFS channel,
driver will do a full scan. As its a single channel scan which is a
DFS channel would be ignored and the num of channels to scan would
be zero.

And if the number of channels to scan are zero, driver
does a full scan which would impact the overall connection
time.

To address this, enable DFS channel for a single
channel scan.

Change-Id: I166b9674a6cb6bb9c180c1c8d68480440ea867be
CRs-Fixed: 2038974

core/sme/src/csr/csr_api_scan.c

@@ -3701,7 +3701,8 @@ static void csr_scan_copy_request_valid_channels_only(tpAniSirGlobal mac_ctx,
 			if (((src_req->skipDfsChnlInP2pSearch ||
 				skip_dfs_chnl) && (CHANNEL_STATE_DFS ==
 				wlan_reg_get_channel_state(mac_ctx->pdev,
-				src_req->ChannelInfo.ChannelList[index])))) {
+				src_req->ChannelInfo.ChannelList[index]))) &&
+				(src_req->ChannelInfo.numOfChannels > 1)) {
 				sme_debug(
 					"reqType= %s (%d), numOfChannels=%d, ignoring DFS channel %d",
 					sme_request_type_to_string(