When MLO SAP is started with two different bands, the 2.4 GHz
link follows the 5GHz and restarts on the same channel
as 5 GHz link.
The user configured frequency for the SAP is cached on the
psoc, therefore during the concurrency check after bringing
up the second connection, 2.4 GHz link considers the new
user configured frequency of 5GHz link and moves to the same
channel.
Save the user configured frequency per vdev to prevent
cross-utilization.
Change-Id: I62f883bf818332bb7d0c838e6ed629a8f2d2f21b
CRs-Fixed: 3209394
19dd97f211