Add system service for slices

Will be used to manage permissions and possibly pinned state for slices.

Test: manual
Change-Id: Ie53f4988f817ac5b920087567dbac751e2857dbf
diff --git a/Android.bp b/Android.bp
index 81cd65c..4ef3af0 100644
--- a/Android.bp
+++ b/Android.bp
@@ -98,6 +98,7 @@
         "core/java/android/app/backup/IRestoreObserver.aidl",
         "core/java/android/app/backup/IRestoreSession.aidl",
         "core/java/android/app/backup/ISelectBackupTransportCallback.aidl",
+        "core/java/android/app/slice/ISliceManager.aidl",
         "core/java/android/app/timezone/ICallback.aidl",
         "core/java/android/app/timezone/IRulesManager.aidl",
         "core/java/android/app/usage/ICacheQuotaService.aidl",