Currently DFS object can only be allocated if radio supports 5G.
Rome supports 5G and saves its wireless_mode in hal_reg_cap of
psoc->service_param because Rome FW does not support wmi event
wmi_service_ready_ext_event_id.
Check wireless_modes based on different DFS_SUPPORT.
Change-Id: I0120dde4fcf47bd71f6da512fae64dd62f5f46c8
CRs-Fixed: 2179925