The value 2 is to enable STA+SAP force SCC on DFS channel if STA
is already on DFS channel & also to allow SAP to come up on DFS
channel stand alone & perform CAC (DFS master mode). Set default
value of 2 for g_sta_sap_scc_on_dfs_chan.
Change-Id: Ic1873e1a5b79086aa3e41d3eecea2049b7fc3adf
CRs-Fixed: 2560614