Update the cfg layer with new channel info

Update the cfg layer with new channel info

The upper layer is not notified of the change in channel after roaming.
This results in AGO creation on incorrect channel (previous AP channel)
after roaming. This change will update the cfg layer with the new channel
info after receiving romaing event.

Bug 200024418

Change-Id: Iabe7b329edc14fcc1491ec99966d06f249468105
Signed-off-by: Shital Jaju <shital.jaju@broadcom.com>
(cherry picked from commit df1e9aa0c460ee38f07a9a2ecd20006bf825c8a3)
Reviewed-on: http://git-master/r/552767
Reviewed-by: Bibhay Ranjan <bibhayr@nvidia.com>
Reviewed-by: Srinivas Ramachandran <srinivasra@nvidia.com>
Tested-by: Srinivas Ramachandran <srinivasra@nvidia.com>
Reviewed-by: Ashutosh Jha <ajha@nvidia.com>