As per discussion in the change that adds pw_gpio, we would like to name
the module pw_digital_io. Doing the rename in a follow-up change makes
the original discussion easier to follow.
Change-Id: I27a40e3f4899b2a3498323457866b785ca0ddc06
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/98040
Reviewed-by: Wyatt Hepler <hepler@google.com>
Commit-Queue: Anton Markov <amarkov@google.com>
