Generated new vendor header files from upstream SVD files using:
./SVDConv "$PICO_SDK_DIR"/src/rp2040/hardware_regs/rp2040.svd \
--generate=header --fields=macro --fields=enum
Note: The missing `--fields=struct` flag resulted in the header no
longer containing bit-fields to represent different fields
within registers. While this would generally ease writing code,
the RP2040 has the unpleasant feature of corrupting the
remaining bits of the register when a write access that is not
word-sized occurs in the memory mapped I/O area. This could
happen e.g. when a bit field is byte-sized and byte-aligned.
