Define VehicleHalInterfaceDefaults to wrap VHAL backend.

This allows prevents libraries from directly depending on a specific
version of AIDL VHAL interface, which allows an easier update for
VHAL interface version.

Test: Local build.
Bug: 235152525
Change-Id: I7a652f42d149acbcb52cdb98e1f73a0e600d97db
diff --git a/automotive/vehicle/aidl/impl/Android.bp b/automotive/vehicle/aidl/impl/Android.bp
index d24a739..196f431 100644
--- a/automotive/vehicle/aidl/impl/Android.bp
+++ b/automotive/vehicle/aidl/impl/Android.bp
@@ -19,10 +19,16 @@
 }
 
 cc_defaults {
+    name: "VehicleHalInterfaceDefaults",
+    static_libs: [
+        "android.hardware.automotive.vehicle-V1-ndk",
+    ],
+}
+
+cc_defaults {
     name: "VehicleHalDefaults",
     static_libs: [
         "android-automotive-large-parcelable-lib",
-        "android.hardware.automotive.vehicle-V1-ndk",
         "libmath",
     ],
     shared_libs: [
@@ -37,6 +43,7 @@
         "-Wthread-safety",
     ],
     defaults: [
+        "VehicleHalInterfaceDefaults",
         "android-automotive-large-parcelable-defaults",
     ],
 }