dt-bindings: remoteproc: qcom,sm8350-pas: Add SC8280XP

From the software POV, it matches the SM8350's implementation.
Describe it as such, with a fallback.

Signed-off-by: Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>
Acked-by: Rob Herring (Arm) <robh@kernel.org>
Tested-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com> # Lenovo X13s
Link: https://lore.kernel.org/r/20250503-topic-8280_slpi-v1-1-9400a35574f7@oss.qualcomm.com


Signed-off-by: Bjorn Andersson <andersson@kernel.org>