Improvements for Chip_ID read #1120
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The algorithm for reading the chip_id has been rewritten. Now it is based on the relationship between the DBGMCU_IDCODE register address and the part number (ARM core) from the cpu_id.
This algorithm should be more robust because it looks for chip_id at a specific address.
(Related to #903, #1008)
(Partially fixes #1008)