With single netdev multi vdev changes, each adapter now can
have multiple VDEVs. To get the right VDEV reference, callers
have to pass the link info corresponding to that VDEV.
Change hdd_objmgr_get_vdev_by_user() API definition to
fetch lock protected VDEV reference from link info
instead of adapter.
The existing callers moved to deflink in adapter.
Change-Id: I3be810994f8768104c9a93491966a13d3b159e5c
CRs-Fixed: 3448468
dc43def130