[attestation] Add API to check AVF RKP Hal presence in VM Attestation

This cl adds a new API in VirtualMachineManager to check whether
remote attestation is supported on a device.

Since Remote Attestation is a strongly recommended feature for Android
V, the new API is needed to determine whether we should proceed with
the Remote Attestation CTS tests.

Bug: 329652894
Test: atest MicrodroidTests
Change-Id: I0941914e7a5f1a483705d3faf7091b47ada41b1f
diff --git a/service_vm/test_apk/Android.bp b/service_vm/test_apk/Android.bp
index cd992db..e69b348 100644
--- a/service_vm/test_apk/Android.bp
+++ b/service_vm/test_apk/Android.bp
@@ -45,7 +45,10 @@
 rust_ffi {
     name: "libvm_attestation_test_payload",
     defaults: ["vm_attestation_test_payload_defaults"],
-    visibility: [":__subpackages__"],
+    visibility: [
+        ":__subpackages__",
+        "//packages/modules/Virtualization/tests/testapk",
+    ],
 }
 
 android_test {