GC channel fixes for better interop with SCC

- Force operating channel as the only channel in channel list attribute for go negotiation
and persistence
- Force an operating channel in go negotiation response even if the GO indicates a different
in negotiation request
- Fix a bug with updating peer operating channel based on GO negotiation confirm

Bug: 7217600
Change-Id: I6da0dc1a49c1d99ae97dcab8ee9899e07a80a6cb
4 files changed