Currently, primary frequency is getting updated from STA context
during get_channel callback. This is causing STA disconnect issue
after channel switch. This is because sta_context won't contain
updated channel information after channel switch.
Update primary frequency from object manger. Object manager will
contain updated channel information after channel switch. Also
update the primary frequency in STA context after channel switch.
Change-Id: I059c3627fbd2c254adeb4c7e4407b1518aa0f771
CRs-Fixed: 2758925