sepolicy: Apps need to read themed resources

Assets such as composed icons and ringtones need to be accessed
by apps.  This patch adds the policy needed to facilitate this.

Change-Id: If47920b2cc5dbafe8d71a621782bb4a3351bd68c
diff --git a/sepolicy/app.te b/sepolicy/app.te
new file mode 100644
index 0000000..761eb5f
--- /dev/null
+++ b/sepolicy/app.te
@@ -0,0 +1,3 @@
+# Themed resources (i.e. composed icons)
+allow appdomain theme_data_file:dir r_dir_perms;
+allow appdomain theme_data_file:file r_file_perms;