init: Don't read serial_number

Pixels use ro.product.model for product, this has no effect

Change-Id: I6caea23a88986633ed25df5ae45fde857bb0fb60

init.qcom.usb.sh

@@ -154,13 +154,6 @@ esac
 
 # check configfs is mounted or not
 if [ -d /config/usb_gadget ]; then
-	# Chip-serial is used for unique MSM identification in Product string
-	msm_serial=`cat /sys/devices/soc0/serial_number`;
-	msm_serial_hex=`printf %08X $msm_serial`
-	machine_type=`cat /sys/devices/soc0/machine`
-	product_string="$machine_type-$soc_hwplatform _SN:$msm_serial_hex"
-	echo "$product_string" > /config/usb_gadget/g1/strings/0x409/product
-
 	# ADB requires valid iSerialNumber; if ro.serialno is missing, use dummy
 	serialnumber=`cat /config/usb_gadget/g1/strings/0x409/serialnumber` 2> /dev/null
 	if [ "$serialnumber" == "" ]; then