pw_analog: Add gmocks for interfaces Change-Id: I43c5a555ff6ee8983ab4f78bf9b3dfb00f06df37 Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/48321 Commit-Queue: Kevin Zeng <zengk@google.com> Reviewed-by: Wyatt Hepler <hepler@google.com>
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