Currently pmo_psoc_get_vdev api just returns the vdev without
taking the vdev reference and it is caller's responsibility to
take the reference, there could be a race condition where after
getting the vdev and before getting the reference of that vdev,
some other thread may delete this vdev.
To avoid this issue use objmgr api to get the vdev for pmo.
Change-Id: I3495589e2dbbb7d8efc579a62fff1a08a92c318f
CRs-Fixed: 2771211
8e37d3f6eb