Make sure the VehiclePropValue object is initialized

If MALLOC_ZERO_CONTENTS is false, the new created VehiclePropValue
object maybe filled with dirty data, we should initialize it so that
its status member can be initialized to zero to avoid timeout when
car services get properties, such as property OBD2_LIVE_FRAME.

Bug: 315728228
Test: hidl_test

Change-Id: I530bc95a3074c917be853f55cd1736558b140da4
Signed-off-by: Liu, Kai1 <kai1.liu@intel.com>