esp32s2: Use the device's EUI-48 address as unique ID #3156
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Before this, the uid was referring to uninitialized memory and varied from run to run.
On my hardware, esptool reports
after this change, the USB descriptor says
SerialNumber: 7CDFA1026CB8
and microcontroller.cpu.id hasNote that the nibble-swapping between USB and cpu.uid is typical. For instance, an stm32 board has USB SerialNumber
24002500F005D42445632302
but hex-converted microcontroller.cpu.id420052000f504d4254363220
.