Increase VHAL property to V4.

Flag: EXEMPT HAL change
Bug: 360461541
Test: Presubmit
Change-Id: I3ff3e65ca19c980d03364da2653553ad477961de
diff --git a/automotive/vehicle/aidl/impl/vhal/Android.bp b/automotive/vehicle/aidl/impl/vhal/Android.bp
index 5cc071d..54d148e 100644
--- a/automotive/vehicle/aidl/impl/vhal/Android.bp
+++ b/automotive/vehicle/aidl/impl/vhal/Android.bp
@@ -66,7 +66,7 @@
     ],
     header_libs: [
         "IVehicleHardware",
-        "IVehicleGeneratedHeaders-V3",
+        "IVehicleGeneratedHeaders-V4",
     ],
     shared_libs: [
         "libbinder_ndk",