Fixed ErrorState.aidl to include int backing.

Bug: 267228426
Test: atest CarPropertyManagerTest
Change-Id: Ibd223f784b1694c844d8fb4025aaefccb6e7de8f
diff --git a/automotive/vehicle/aidl_property/aidl_api/android.hardware.automotive.vehicle.property/current/android/hardware/automotive/vehicle/ErrorState.aidl b/automotive/vehicle/aidl_property/aidl_api/android.hardware.automotive.vehicle.property/current/android/hardware/automotive/vehicle/ErrorState.aidl
index 4fdbe1b..aaf3565 100644
--- a/automotive/vehicle/aidl_property/aidl_api/android.hardware.automotive.vehicle.property/current/android/hardware/automotive/vehicle/ErrorState.aidl
+++ b/automotive/vehicle/aidl_property/aidl_api/android.hardware.automotive.vehicle.property/current/android/hardware/automotive/vehicle/ErrorState.aidl
@@ -32,7 +32,7 @@
 // later when a module using the interface is updated, e.g., Mainline modules.
 
 package android.hardware.automotive.vehicle;
-@VintfStability
+@Backing(type="int") @VintfStability
 enum ErrorState {
   OTHER_ERROR_STATE = (-1),
   NOT_AVAILABLE_DISABLED = (-2),
diff --git a/automotive/vehicle/aidl_property/android/hardware/automotive/vehicle/ErrorState.aidl b/automotive/vehicle/aidl_property/android/hardware/automotive/vehicle/ErrorState.aidl
index 42007fa..0c62575 100644
--- a/automotive/vehicle/aidl_property/android/hardware/automotive/vehicle/ErrorState.aidl
+++ b/automotive/vehicle/aidl_property/android/hardware/automotive/vehicle/ErrorState.aidl
@@ -21,6 +21,7 @@
  * by ADAS STATE properties, but its use may be expanded in future releases.
  */
 @VintfStability
+@Backing(type="int")
 enum ErrorState {
 
     /**