Add libopen_dice nostd wrapper and test it in vmbase_example

This integrates libopen_dice into vmbase_example and performs basic
integration tests.

Bug: 237372981
Test: atest vmbase_example.integration_test
Change-Id: I67f11094cac04c7d72d19497b8b705386d1f0fe1
diff --git a/vmbase/example/Android.bp b/vmbase/example/Android.bp
index 4e62090..e9a3f98 100644
--- a/vmbase/example/Android.bp
+++ b/vmbase/example/Android.bp
@@ -11,6 +11,7 @@
     rustlibs: [
         "libaarch64_paging",
         "libbuddy_system_allocator",
+        "libdice_nostd",
         "liblog_rust_nostd",
         "libvmbase",
     ],