add sakura and nitrogen to 12bit backlights

Change-Id: I2abcf60932cc43437b52c4ea3390dd9968a30dbd
diff --git a/rw-system.sh b/rw-system.sh
index 79bf302..f399a6a 100644
--- a/rw-system.sh
+++ b/rw-system.sh
@@ -123,7 +123,7 @@
     chown system:9015 /sys/devices/soc/soc:fpc_fpc1020/irq_cnt
 fi
 
-if getprop ro.vendor.build.fingerprint |grep -q -e Xiaomi/clover/clover -e iaomi/wayne/wayne;then
+if getprop ro.vendor.build.fingerprint |grep -q -i -e xiaomi/clover -e xiaomi/wayne -e xiaomi/sakura -e xiaomi/nitrogen;then
     setprop persist.sys.qcom-brightness $(cat /sys/class/leds/lcd-backlight/max_brightness)
 fi