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The recognition of EIDs is the most error-prone part of caBLE (v1 and
v2) and the current debug logging is useless for diagnosing anything.

This change reworks how EID detection is done and writes much more
helpful information to the device-log.

Change-Id: I7275242ec3505fa0b8a73daa27b42fa33144f38c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1830058
Auto-Submit: Adam Langley <agl@chromium.org>
Reviewed-by: Martin Kreichgauer <martinkr@google.com>
Commit-Queue: Adam Langley <agl@chromium.org>
Cr-Commit-Position: refs/heads/master@{#700848}