arm64: dts: qcom: sm8550-qrd: add QRD8550

Add a minimal DTS for the new QRD8550 board - a mobile-like development
board with SM8550.  Serial, UFS and USB should be working.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Reviewed-by: Abel Vesa <abel.vesa@linaro.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20230210163844.765074-2-krzysztof.kozlowski@linaro.org