cm: Allow LiveDisplay to write to display misc dir

 * Need write permission to create file containing the current mode.

Change-Id: I4ed26412e7ec38861156110c7eb51ef707a0999f
diff --git a/sepolicy/qcom/livedisplay.te b/sepolicy/qcom/livedisplay.te
index ae7b195..394caa3 100644
--- a/sepolicy/qcom/livedisplay.te
+++ b/sepolicy/qcom/livedisplay.te
@@ -1,3 +1,3 @@
 # Storage of default mode by native API
-allow system_server display_misc_file:dir r_dir_perms;
+allow system_server display_misc_file:dir rw_dir_perms;
 allow system_server display_misc_file:file create_file_perms;