pw_i2c: Add gmock for initiator Change-Id: I588ae0c745bfbdd6dd079e3226e9aff07eac6e0d Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/48360 Commit-Queue: Kevin Zeng <zengk@google.com> Reviewed-by: Wyatt Hepler <hepler@google.com>
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