If more than MAX_NUM_CHAN_PER_WMI_CMD are present, wmi buffer size can
exceed the maximum allocated buffer size. So iterate over the channel
list, and send multiple messages till channel list is empty. Also check
if 6 ghz channel is a PSC channel and mark channel flag accordingly.
Change-Id: I977a2d220c750cec1f261377b3838360bd8c0df3
CRs-Fixed: 2522763