Add test api for setting vendor disk image

So far only a single test asserting that setting vendor disk image
requires caller to have USE_CUSTOM_VIRTUAL_MACHINE permission. More
tests to come in the follow up changes.

Bug: 285855433
Test: atest MicrodroidTestApp
Change-Id: Ic68fccbb8f916f30cab1d772f45714d1e75369a2
diff --git a/tests/testapk/Android.bp b/tests/testapk/Android.bp
index fe8f5c9..8a31c21 100644
--- a/tests/testapk/Android.bp
+++ b/tests/testapk/Android.bp
@@ -43,7 +43,10 @@
     ],
     min_sdk_version: "33",
     // Defined in ../vmshareapp/Android.bp
-    data: [":MicrodroidVmShareApp"],
+    data: [
+        ":MicrodroidVmShareApp",
+        ":test_microdroid_vendor_image",
+    ],
 }
 
 // Defaults shared between MicrodroidTestNativeLib and MicrodroidPayloadInOtherAppNativeLib shared