qcacmn: Use objmgr API to get 1st vdev from pdev

If Vdev id is not present driver tries to get vdev with vdev id 0
from pdev. Vdev with vdev_id 0 might not be present on pdev so use
objmgr API wlan_objmgr_pdev_get_first_vdev to get the first vdev.

Change-Id: I2ae0d6056709339a8167582ec327269aa84c93f4
CRs-Fixed: 2349699
2 files changed