drm/xe/vm: Add missing pad and extensions check

drm/xe/vm: Add missing pad and extensions check

Add missing pad and extensions check to xe_vm_get_property_ioctl

v2:
- Combine with other check (Auld)

Fixes: 50c577eab051 ("drm/xe/xe_vm: Implement xe_vm_get_property_ioctl")
Suggested-by: Matthew Auld <matthew.auld@intel.com>
Signed-off-by: Jonathan Cavitt <jonathan.cavitt@intel.com>
Reviewed-by: Matthew Auld <matthew.auld@intel.com>
Reviewed-by: Matthew Brost <matthew.brost@intel.com>
Signed-off-by: Matthew Auld <matthew.auld@intel.com>
Link: https://patch.msgid.link/20260331181216.37775-2-jonathan.cavitt@intel.com