fix sound for polaris

Change-Id: I765e18b41ebc61e359f4d4e78b0f8bfd620a6561
diff --git a/rw-system.sh b/rw-system.sh
index 793506d..c0c806a 100644
--- a/rw-system.sh
+++ b/rw-system.sh
@@ -121,7 +121,7 @@
     setprop persist.sys.qcom-brightness $(cat /sys/class/leds/lcd-backlight/max_brightness)
 fi
 
-if getprop ro.vendor.build.fingerprint |grep -q -e Xiaomi/beryllium/berillium -e Xiaomi/sirius/sirius -e Xiaomi/dipper/dipper -e Xiaomi/ursa/ursa;then
+if getprop ro.vendor.build.fingerprint |grep -q -e Xiaomi/beryllium/berillium -e Xiaomi/sirius/sirius -e Xiaomi/dipper/dipper -e Xiaomi/ursa/ursa -e Xiaomi/polaris/polaris;then
     mount -o bind /mnt/phh/empty_dir /vendor/lib64/soundfx/
 fi