If SAP start on 5G DFS channel, it will keep in CAC for 1 minute.
If Disable 5G by cmd: hostapd_cli -iwlan2 set setband 2G during
this minute, SAP won't switch to 2G since SAP isn't in started
state, and SAP start also fail since SAP operate channel
becomes disabled instead of DFS state, SAP will be hung in DFS
state.
Fix: When CAC complete and SAP start, check SAP operate channel
with wlan_reg_chan_has_dfs_attribute_for_freq.
After SAP started, will check for SAP restart,
if found current band is disabled, will switch to 2G band.
Change-Id: I3c29b5d324d4324ce958a5c2cd2102df2cc183ff
CRs-Fixed: 2601081
ae4d3c41ca