sepolicy: allow gallery2 to crop avatar

http://jira.omnirom.org/browse/OMNI-1336

Change-Id: Ieb08afba845e9e4b09f0e187eb4961ccef3f0907
diff --git a/sepolicy/platform_app.te b/sepolicy/platform_app.te
index 18ca1e3..d01f20f 100644
--- a/sepolicy/platform_app.te
+++ b/sepolicy/platform_app.te
@@ -5,3 +5,6 @@
 
 # e.g. renderscript in Gallery2 wants execute perms
 allow platform_app app_data_file:file execute;
+# gallery2 crop avatar
+allow platform_app system_app_data_file:file { create_file_perms rw_file_perms };
+