mesh: Enable 160 MHz bandwidth support for 6 GHz in IEEE 802.11s mesh

mesh: Enable 160 MHz bandwidth support for 6 GHz in IEEE 802.11s mesh

Since the 6 GHz band has no DFS channels, enable 6 GHz 160 MHz bandwidth
as the default configuration for IEEE 802.11s mesh.

example:
network={
 ssid="6gmesh160"
 key_mgmt=SAE
 mode=5
 frequency=6275
 psk="1234567890"
}

Signed-off-by: P Praneesh <ppranees@codeaurora.org>
Signed-off-by: Pradeep Kumar Chitrapu <pradeepc@codeaurora.org>