Be more flexible wrt when to fix Samsung backlight selinux context

rw-system.sh

@@ -920,7 +920,7 @@ fi
 
 if getprop ro.vendor.build.fingerprint |grep -qiE '^samsung/';then
     for f in /sys/class/lcd/panel/actual_mask_brightness /sys/class/lcd/panel/mask_brightness /sys/class/lcd/panel/device/backlight/panel/brightness /sys/class/backlight/panel0-backlight/brightness;do
-        if [ "$(stat -c '%U' "$f")" == "root" ];then
+        if [ "$(stat -c '%U' "$f")" == "root" ] || [ "$(ls -lZ "$f" | grep -oE 'u:object_r:[^:]*:s0')" == "u:object_r:sysfs:s0" ];then
             chcon u:object_r:sysfs_lcd_writable:s0 $f
             chmod 0644 $f
             chown system:system $f