arm64: dts: qcom: sc8280xp: Use MMCX for all DP controllers

While MDSS_GDSC is a subdomain of MMCX, Linux does not respect this
relationship and sometimes invokes sync_state on the rpmhpd (MMCX)
before the DisplayPort controller has had a chance to probe.

The result when this happens is that the power is lost to the multimedia
subsystem between the probe of msm_drv and the DisplayPort controller -
which results in an irrecoverable state.

While this is an implementation problem, this aligns the power domain
setting of the one DP instance with that of all the others.

Fixes: 57d6ef683a15 ("arm64: dts: qcom: sc8280xp: Define some of the display blocks")
Signed-off-by: Bjorn Andersson <[email protected]>
Reviewed-by: Johan Hovold <[email protected]>
Reviewed-by: Konrad Dybcio <[email protected]>
Signed-off-by: Bjorn Andersson <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

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