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Currently there are code duplication that does similar things to detect
hotword input device. Now we move all the logic into cras_audio_handler
to simplify the code.

Bug: None
Test: locally build and run
Change-Id: I08df6cef18a17dd3c5b2eff6f5b4193aecf0b3e5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1686951Reviewed-by: Jenny Zhang <jennyz@chromium.org>
Reviewed-by: Guido Urdaneta <guidou@chromium.org>
Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Reviewed-by: Tao Wu <wutao@chromium.org>
Commit-Queue: Xiaohui Chen <xiaohuic@chromium.org>
Cr-Commit-Position: refs/heads/master@{#675764}