dt-bindings: arm: qcom: add QRD8550

Add board compatible for QRD8550 - a mobile-like development board with
SM8550.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Acked-by: Rob Herring <robh@kernel.org>
Reviewed-by: Abel Vesa <abel.vesa@linaro.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20230210163844.765074-1-krzysztof.kozlowski@linaro.org