When 5G band is disabled by set band, need SAP switch channel
to 2G. When 5G band is enabled again, need SAP switch back to
original 5G channel. When sta connecting, SAP can't switch
channel.
Merge logic of SAP channel switch for band change and for force
scc with sta, both are implemented in:
policy_mgr_check_concurrent_intf_and_restart_sap now.
After sta associate succeed or fail,
policy_mgr_check_concurrent_intf_and_restart_sap is called again
to check and try SAP CSA for band capability change.
Change-Id: I8574209aac3cabb748a8ec05050244f480e1a0e9
CRs-Fixed: 2589021
e75eb51af1