storaged: allow shell to call dumpsys storaged

Test: adb kill-server && adb shell dumpsys storaged
Bug: 36492915
Change-Id: I3a1a2ad2f016ddd5770d585cae82c8be69001df9
diff --git a/private/shell.te b/private/shell.te
index aab0a15..c24bfd3 100644
--- a/private/shell.te
+++ b/private/shell.te
@@ -10,3 +10,6 @@
 # Run app_process.
 # XXX Transition into its own domain?
 app_domain(shell)
+
+# allow shell to call dumpsys storaged
+binder_call(shell, storaged)