Add remote_provisioning system service

This service is callable by system components like keystore2. This
service calls into a mainline module API to do all the work for remote
provisioning.

Also include new OWNERS for the RemoteProvisioning implementation.

Bug: 254112668
Test: Locally modify keystore to call the new service
Change-Id: I6708d0b415798c78a4d66f279589d9def552ae78

core/java/Android.bp

@@ -376,6 +376,20 @@ aidl_interface {
     },
 }
 
+// Build Rust bindings for remote provisioning. Needed by keystore2.
+aidl_interface {
+    name: "android.security.rkp_aidl",
+    unstable: true,
+    srcs: [
+        "android/security/rkp/*.aidl",
+    ],
+    backend: {
+        rust: {
+            enabled: true,
+        },
+    },
+}
+
 aidl_interface {
     name: "android.debug_aidl",
     unstable: true,