SensorTile: use SWO as debug output printf

SWO is very easy to use, and I want to use it when debugging SensorTile SWO.

Check STM32L476XXthe data sheet and find that the SWOinterface is also PB3on the
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Look at the schematic again:
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PB3There is no external connection, which is a tragedy. SensorTile can no longer be used SWOas debug output.

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