qcacld-3.0: Set 160 MHz chan width for 6 GHz band channel

Currently 160 MHz chan width set for 6 GHz band channel is not
allowing.
This change is to set 160 MHz chan width if 6 GHz band channel support.

Example cmd: hostapd_cli DRIVER CHANNEL_SWITCH <Channel> <BW>

Change-Id: I5955ba524d3e77fb49d7acf4098fd0c564e138b0
CRs-Fixed: 3356605