qcacmn: Don't scan 6 GHz channels if fcc constraint set
If fcc constraint is set host disables all 6 GHz channels
except for the STA, P2P client connect 6 GHz channels,
but host shouldn't scan any 6 GHz channels.
Add changes to filter out 6 GHz channels from scan list.
Change-Id: Ibc6b34a5d294d1d11f1717be135030760359bd53
CRs-Fixed: 3481006