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/zygote.te b/sepolicy/zygote.te
new file mode 100644
index 0000000..8bee8fe
--- /dev/null
+++ b/sepolicy/zygote.te
@@ -0,0 +1,3 @@
+allow zygote theme_data_file:file r_file_perms;
+allow zygote theme_data_file:dir r_dir_perms;
+