[rkp] Make android.security.rkp_aidl-rust available to virt apex

This allows AVF to retrieve the remote provisioned keys from rkpd.

Bug: 241428146
Test: m com.android.virt
Change-Id: I5d622f8017ca10320a647ac65c2a96f845908100
diff --git a/core/java/Android.bp b/core/java/Android.bp
index 26b7581..42aae56 100644
--- a/core/java/Android.bp
+++ b/core/java/Android.bp
@@ -414,6 +414,10 @@
     backend: {
         rust: {
             enabled: true,
+            apex_available: [
+                "//apex_available:platform",
+                "com.android.virt",
+            ],
         },
     },
 }