ASoC: fsl_micfil: Add Hardware Voice Activity Detector support
The Hardware Voice Activity Detector (HWVAD) is a block responsible for detect voice activity in a channel selected by the user. It can be configured in Envelope-based or Energy-based mode. There are additional two interrupts for HWVAD, one is event interrupt, another is error interrupt. Enable hwvad in parallel with recording. when voice activity detected, HWVAD will be disabled and alsa control notification is triggerred. Signed-off-by: Shengjiu Wang <shengjiu.wang@nxp.com> Link: https://lore.kernel.org/r/1663925494-9941-1-git-send-email-shengjiu.wang@nxp.comSigned-off-by: Mark Brown <broonie@kernel.org>
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