This fixes the H7 af.csv files to include the dual-pad information, by
listing the ADCs supported on the _C pad with a C_ADC prefix.
Minimal change to make-pins.py to ignore these entries. This will be
implemented later to emit constants (similar to ADC.CORE_TEMP) to access
these channels.
This work was funded through GitHub Sponsors.
Signed-off-by: Jim Mussared <jim.mussared@gmail.com>
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