Allow vold_prepare_subdirs to manage supplemental_app_data_file

When an user is deleted, vold_prepare_subdirs needs to be able to
destroy the subdirs.

Bug: 220114055
Bug: 217543371
Test: atest CtsMultiUserHostTestCases
Ignore-AOSP-First: Feature is being developed in internal branch
Change-Id: I987ce31e648d93e124f1644348f463dd7a406c19
Merged-In: I987ce31e648d93e124f1644348f463dd7a406c19
(cherry picked from commit f4ff1e3a3d3513dc591c857c0bd8473941063f19)
diff --git a/private/vold_prepare_subdirs.te b/private/vold_prepare_subdirs.te
index e4004e4..e6a2370 100644
--- a/private/vold_prepare_subdirs.te
+++ b/private/vold_prepare_subdirs.te
@@ -26,6 +26,7 @@
     iris_vendor_data_file
     rollback_data_file
     storaged_data_file
+    supplemental_app_data_file
     system_data_file
     vold_data_file
 }:dir { create_dir_perms relabelto };
@@ -41,6 +42,7 @@
     iris_vendor_data_file
     rollback_data_file
     storaged_data_file
+    supplemental_app_data_file
     system_data_file
     vold_data_file
 }:file { getattr unlink };