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Leverage speech-micro to detect hotword.
BRANCH=none
BUG=b:122027734, b:123268236, b:132319180
TEST=1. define CONFIG_AUDIO_CODEC in board.h
2. define CONFIG_AUDIO_CODEC_DMIC in board.h
3. define CONFIG_AUDIO_CODEC_DMIC_SOFTWARE_GAIN in board.h
4. define CONFIG_AUDIO_CODEC_DMIC_MAX_SOFTWARE_GAIN in board.h
5. define CONFIG_AUDIO_CODEC_WOV in board.h
6. make BOARD=kukui_scp -j
Change-Id: I8b238fd8bd9af8e70d5a747650eb8b7dbf4200cb
Signed-off-by: Tzung-Bi Shih <tzungbi@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/1602453
Reviewed-by: Nicolas Boichat <drinkcat@chromium.org>
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