Firmware advertises WMI_SERVICE_ROAM_SCAN_CHANNEL_LIST_TO_HOST_SUPPORT
at the time of initialization, that means host can querry for roam scan
channels list to firmware.
Host driver sends WMI_ROAM_GET_SCAN_CHANNEL_LIST_CMDID to firmware to
querry roam scan channels list and firmware responds with an event
WMI_ROAM_SCAN_CHANNEL_LIST_EVENTID.
Change-Id: I419a0206d7b06b6186d0c333c951bca5206f342f
CRs-Fixed: 2620607