[PATCH] ASoC: nau8821: Add DMIC selections.

[Mark Brown]

On Tue, Dec 28, 2021 at 11:51:01AM +0800, Seven Lee wrote:
> Add the following two control options:
> 1. DMIC pin slew rate selection.
> 2. DMIC clock speed selection.

The clock speed seems sensible enough to control from userspace since
it's going to be a power/performance tradeoff but why also expose the
slew rate to userspace - that seems more like something that would come
from the board design?
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