Currently, Updation of vdev related parameters
policy_mgr_vdev_entry_info is conditional. Conditional
updation can cause uninitialized usage of subtype of
policy_mgr_vdev_entry_info by policy manager to get concurrency
mode.
Fix is to initialize policy_mgr_vdev_entry_info with zero.
Change-Id: If1350bd66705defdea2e69d559de0a6578acde02
CRs-Fixed: 2423871