Fix thread DCHECK for CrOS amplitude peak detection

This fix the DCHECK on ChromeOS when Tracing audio with amplitude peak
detection: The callback are on a different thread for each CRAS stream.
The solution used is the same as the one used on the Windows
Low Latency audio manager.

This change ensure the amplitude_peak_detector is created prior the
cras stream is added.

Bug: 1425455
Change-Id: I16206ccfaa4164bd24a31c03dfa61af9682e03e0
Tested: with a local build playing youtube and bandcamp.
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4455002
Reviewed-by: Thomas Guilbert <tguilbert@chromium.org>
Commit-Queue: Lionel Koenig Gélas <lionelk@google.com>
Cr-Commit-Position: refs/heads/main@{#1135086}