qcacld-3.0: Add dfs channel to ACS chan selection list

Single SAP is not allowed on the DFS channel with the
g_sta_sap_scc_on_dfs_chan value = 1.
If g_sta_sap_scc_on_dfs_chan = 1 and STA is present on the
dfs channel, allow the dfs channel to be added to ACS channel
selection list.

Change-Id: I19f799628febd495302547a3f223e8b2561d8b78
CRs-Fixed: 3271710