arm64: dts: qcom: add SC8280XP platform

Introduce initial support for the Qualcomm SC8280XP platform, aka 8cx
Gen 3. This initial contribution supports SMP, CPUfreq, CPU cluster
idling, GCC, TLMM, SMMU, RPMh regulators, power-domains and clocks,
interconnects, some QUPs, UFS, remoteprocs, USB, watchdog, LLCC and
tsens.

Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Reviewed-by: Johan Hovold <johan+linaro@kernel.org>
Reviewed-by: Konrad Dybcio <konrad.dybcio@somainline.org>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20220629041438.1352536-4-bjorn.andersson@linaro.org