qcacld-3.0: ACS select safe channel

In case of no scan result, ACS logic should select one channel based on
any of the below condition (as per mentioned order):
1. First valid channel from PCL
2. First safe channel from safe_channels
3. ACS start channel

Change-Id: Ife1d7a0a963b7773b92c091ed7cc976fcda25347
CRs-Fixed: 2430935
1 file changed