dt-bindings: remoteproc: qcom,sm8550-pas: Make SDX75 MPSS fallback to SM8650

The SDX75 MPSS is an instance of the SM8650 MPSS: same interrupts,
memory regions and power domain topology. It is currently modelled as
a standalone compatible and lives alongside sm8650 in every mpss
allOf conditional, which duplicates the constraint and hides the
hardware relationship.

Move qcom,sdx75-mpss-pas out of the standalone enum into the fallback
items block alongside Hawi and Maili, and drop it from the mpss
memory-region and power-domain conditional lists. contains: on the
fallback compatible qcom,sm8650-mpss-pas keeps the constraints firing
for the array form.

Two consequences of the tightening are worth calling out:

- qcom,sdx75-mpss-pas as a single-string compatible is no longer
  valid per the binding, so the in-tree sdx75.dtsi form fails
  dt_binding_check. That is fixed by the follow-up DTS patch which
  switches sdx75.dtsi to the fallback array form.

- The driver keeps its standalone qcom,sdx75-mpss-pas of_match entry
  so already-deployed DTBs continue to probe. The binding is
  intentionally stricter than the driver here; pruning the driver
  match is left as a separate cleanup once the DTB rollout is
  complete.

Signed-off-by: Mukesh Ojha <mukesh.ojha@oss.qualcomm.com>
Acked-by: Manivannan Sadhasivam <manivannan.sadhasivam@oss.qualcomm.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@oss.qualcomm.com>
Link: https://lore.kernel.org/r/20260805132129.2713174-3-mukesh.ojha@oss.qualcomm.com
Signed-off-by: Bjorn Andersson <andersson@kernel.org>

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