qcacmn: Add wmi support to get firmware roam scan stats

Add wmi layer support to get firmware roam scan statistics which includes
scoring of roam candidates, channels, old and new bssids etc.,

Change-Id: I3a0aafbe66d12eea40e71ceb4c7c3a60b9d6e04f
CRs-Fixed: 2203904
3 files changed