Storaged permissions for task I/O

Allow storaged to read /proc/[pid]/io
Grant binder access to storaged
Add storaged service
Grant storaged_exec access to dumpstate
Grant storaged binder_call to dumpstate

Bug: 32221677

Change-Id: Iecc9dba266c5566817a99ac6251eb943a0bac630
diff --git a/private/service_contexts b/private/service_contexts
index 2f31393..5414f11 100644
--- a/private/service_contexts
+++ b/private/service_contexts
@@ -133,6 +133,7 @@
 sip                                       u:object_r:radio_service:s0
 soundtrigger                              u:object_r:voiceinteraction_service:s0
 statusbar                                 u:object_r:statusbar_service:s0
+storaged                                  u:object_r:storaged_service:s0
 SurfaceFlinger                            u:object_r:surfaceflinger_service:s0
 task                                      u:object_r:task_service:s0
 telecom                                   u:object_r:telecom_service:s0