Update offchannel frequency based on peer caps such as
1. If 6 GHz is supported then select the ini preferred 6 GHz channel
frequency if peer also supports the same channel.
2. If 6 GHz is supported and peer doesn't support the ini preffered
channel frequency then select the very first 6 GHz channel which
peer supports as preffered offchannel.
3. If peer doesn't support 6 GHz, then select ini preffered 5 GHz
off channel frequency, given that peer should also support it.
4. If peer doesn support 6 GHz and also doesn't support ini preferred
5 GHz offcahnnel, then select the very first 5 GHz channel it
supports.
Update preffered offchannel Bandwidth such as take minimum of peer
supported max bandwith which is extracted from supported opclass and
max Bw device supports.
Change-Id: I93412774f35280105b22d5ec44895572f9d7aeef
CRs-Fixed: 3266066
0d8b108c4a