Define TARGET_OUT_VENDOR_APPS_PRIVILEGED

When LOCAL_PROPRIETARY_MODULE is set to true when building an apk with,
LOCAL_PRIVILEGED_MODULE set to true, the path is unknown.

Add TARGET_OUT_VENDOR_APPS_PRIVILEGED to path definitions.

Change-Id: Icbbafba96b7880f51ca3afcee53d5f3dd5b86a45
Signed-off-by: Benjamin Pujol <benjamin.pujol@intel.com>
Signed-off-by: Zhiquan Liu <zhiquan.liu@intel.com>