Adding android_filesystem_config.h import

Addressing outstanding todo in VehicleHalManager

Bug: 148098383
Test: m vts and atest android.hardware.automotive.vehicle@2.0-manager-unit-tests
Change-Id: I9a222077d0de91f8c7353c80d8a1aeff53cffa61
diff --git a/automotive/vehicle/2.0/default/common/src/VehicleHalManager.cpp b/automotive/vehicle/2.0/default/common/src/VehicleHalManager.cpp
index 5bebd1e..b09e9bf 100644
--- a/automotive/vehicle/2.0/default/common/src/VehicleHalManager.cpp
+++ b/automotive/vehicle/2.0/default/common/src/VehicleHalManager.cpp
@@ -27,14 +27,11 @@
 #include <android/log.h>
 
 #include <hwbinder/IPCThreadState.h>
-
+#include <private/android_filesystem_config.h>
 #include <utils/SystemClock.h>
 
 #include "VehicleUtils.h"
 
-// TODO: figure out how to include private/android_filesystem_config.h instead...
-#define AID_ROOT 0 /* traditional unix root user */
-
 namespace android {
 namespace hardware {
 namespace automotive {