Make android.hardware.security.rkp-rust available for virt apex

Bug: 274881098
Test: atest MicrodroidHostTests
Change-Id: I5791bc8f0aa4dd5938871edb8b67f4d0d1ee2599
diff --git a/security/rkp/aidl/Android.bp b/security/rkp/aidl/Android.bp
index 5285477..0ebc3b7 100644
--- a/security/rkp/aidl/Android.bp
+++ b/security/rkp/aidl/Android.bp
@@ -28,6 +28,10 @@
         },
         rust: {
             enabled: true,
+            apex_available: [
+                "//apex_available:platform",
+                "com.android.virt",
+            ],
         },
     },
     versions_with_info: [