[incremental] parcelable for incfs file descriptors

This parcelable is used to pass incfs fds from vold to system_server.

Test: builds
Change-Id: I7f0af8798d12815fbae404afabf4a88229a705da
Merged-In: Ifc3a43633356951b239486d66ee80d120bc4ab76
diff --git a/Android.bp b/Android.bp
index 100f70d..96fd585 100644
--- a/Android.bp
+++ b/Android.bp
@@ -771,6 +771,31 @@
     },
 }
 
+filegroup {
+    name: "incremental_aidl",
+    srcs: [
+        "core/java/android/os/incremental/IncrementalFileSystemControlParcel.aidl",
+    ],
+    path: "core/java",
+}
+
+aidl_interface {
+    name: "libincremental_aidl",
+    srcs: [
+        ":incremental_aidl",
+    ],
+    backend: {
+        java: {
+            sdk_version: "28",
+        },
+        cpp: {
+            enabled: true,
+        },
+        ndk: {
+            enabled: true,
+        },
+    },
+}
 
 gensrcs {
     name: "gen-platform-proto-constants",