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read android device serial number from sysfs node
read android serial number value from sysfs node instead of kernel command line. Upstream boot managers e.g., systemd-boot does not populate kernel command line with parameter androidboot.serialno. Reading serial number from sysfs node /sys/devices/soc0/serial_number generalizes the approach and makes it independent of bootloader that loads kernel. Change-Id: I4998406b98aa928c852e897d1219c3c79e38b2ab
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