Add host_supported to VHAL libs.

We need to build a FakeVehicleHardware impl on host, thus we need
to add the host_supported option.

Test: Local build on host.
Bug: 328316981
Change-Id: Ia21d26640c465846423cab1a0ff8a283c798b92a
diff --git a/automotive/vehicle/aidl/Android.bp b/automotive/vehicle/aidl/Android.bp
index ed18ebc..ce9e7a1 100644
--- a/automotive/vehicle/aidl/Android.bp
+++ b/automotive/vehicle/aidl/Android.bp
@@ -60,5 +60,5 @@
         },
 
     ],
-
+    host_supported: true,
 }