Currently, all roam params are updated to firmware whenever
a new param(e.g. preferred channels) is configured by the
userspace. This may overwrite the firmware learned data with
fresh config which is not intended.
Isolate the configured param update to firmware to avoid
tampering other params.
As there are multiple roam params, isolate ROAM CHAN configuration
for now. Incremental changes can be added to make other params
adapt to this.
Change-Id: Ib8c01e42263a0d77b5747f71591ac282909ed7d3
CRs-Fixed: 3856863
6c13ae9e55