As part of 320MHz bandwidth support for 11BE, add 320MHz bandwidth
in WMA layer, where in particular set bw_320 to 1 in wma_send_peer_assoc
and populate ch_width to 320MHz in wma_update_channel_list.
Change-Id: I61793add8d86b0557bd4eed78233860e6ade1c18
CRs-Fixed: 2935851