stingray: Set iProduct string to $ro.boot.modelno

So that we use the same values as we were using on honeycomb

Bug: 5853250
Change-Id: I8f9e1120001389f856484bdd596b1c7f21c84c8c
diff --git a/init.stingray.usb.rc b/init.stingray.usb.rc
index f3126d7..1f6851c 100644
--- a/init.stingray.usb.rc
+++ b/init.stingray.usb.rc
@@ -1,6 +1,6 @@
 on boot
     write /sys/class/android_usb/android0/iManufacturer $ro.product.manufacturer
-    write /sys/class/android_usb/android0/iProduct $ro.product.model
+    write /sys/class/android_usb/android0/iProduct $ro.boot.modelno
     write /sys/class/android_usb/android0/iSerial $ro.serialno
     write /sys/class/android_usb/android0/f_rndis/manufacturer Motorola
     write /sys/class/android_usb/android0/f_rndis/vendorID 22b8