arm64: dts: qcom: sc8280xp-arcata: Drop duplicate DMIC supplies

Align with the reference implementation from the ThinkPad X13s.

The audio-routing setup specifies two power supplies for each DMIC,
but only one of them can be active at the same time.

Drop the redundant routes to the pull-up "VA MIC BIASn" supplies as
done in commit a2e617f4e698 ("arm64: dts: qcom: sc8280xp-x13s: Drop
duplicate DMIC supplies").

There is no functional difference except that we skip briefly switching
to pull-up mode when shutting down the microphone.

Cc: Stephan Gerhold <stephan.gerhold@linaro.org>
Reviewed-by: Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>
Signed-off-by: Jérôme de Bretagne <jerome.debretagne@gmail.com>
Link: https://lore.kernel.org/r/20260604-surface-sp9-5g-for-next-v3-10-6aa6f6612c10@gmail.com
Signed-off-by: Bjorn Andersson <andersson@kernel.org>

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