arm64: dts: qcom: x1-denali: Fix microphone distortion

The microphones (2x) on Surface Pro 11 are currently ususable due to a
misconfigured sample rate, which results in a very distorted recording
with the voice barely audible.

Under Windows, the DMIC0_CTL register is set to 0x00000005 while
recording:

   bit 0 = 1 --> DMIC0 enabled
bits 3:1 = 2 --> DMIC clock divider = /4

The current dmic-sample-rate of 4800000 corresponds to the default DMIC
clock divider of /2.

Dropping dmic-sample-rate to 2400000 sets the divider to /4, matching
the working Windows configuration and resulting in perfect audio.

While we're at it, remove the reference to dmic23_default, as we only
have two microphones and don't need to configure the pins for a 3rd/4th
microphone.

Signed-off-by: Dale Whinham <daleyo@gmail.com>
Reviewed-by: Abel Vesa <abel.vesa@oss.qualcomm.com>
Reviewed-by: Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>
Link: https://lore.kernel.org/r/20260830-surface-pro-11-mic-fix-v1-1-36a53140373b@gmail.com
Signed-off-by: Bjorn Andersson <andersson@kernel.org>

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