lineage: Set perms on reading_mode sysfs

* This is now supported by the common sysfs impl,
  so the perms should be set on the node

Change-Id: I079301a8684f3038b7e5e72b7b2d830259c4fe60
diff --git a/prebuilt/common/etc/init/lineage-livedisplay.rc b/prebuilt/common/etc/init/lineage-livedisplay.rc
index 504b479..8979369 100644
--- a/prebuilt/common/etc/init/lineage-livedisplay.rc
+++ b/prebuilt/common/etc/init/lineage-livedisplay.rc
@@ -12,3 +12,5 @@
     chmod 0660 /sys/devices/virtual/graphics/fb0/sre
     chown system system /sys/devices/virtual/graphics/fb0/color_enhance
     chmod 0660 /sys/devices/virtual/graphics/fb0/color_enhance
+    chown system system /sys/devices/virtual/graphics/fb0/reading_mode
+    chmod 0660 /sys/devices/virtual/graphics/fb0/reading_mode