Add macro ROAM_OFFLOAD_V1 for new code and implement below functions
for connection manager roam part:
csr_handle_roam_state_change() roam offload state related handler.
Filling WMI_ROAM_SCAN_RSSI_THRESHOLD cmd parameters related process.
Change-Id: I0351155ca5a3d68ade6568c7527c5708582ccf1a
CRs-Fixed: 2730826