init: Set oplus camera watermark property

* This prop helps display the device market name
  instead of the model number in the OPLUS camera
  watermark mode.

init/init.oplus.camera.rc

@@ -7,3 +7,6 @@
 on boot
     # OIS
     chown cameraserver cameraserver /sys/kernel/ois_control/dump_registers
+
+on property:vendor.usb.product_string=*
+    setprop ro.vendor.oplus.market.watermark ${vendor.usb.product_string}