arm64: dts: qcom: sm8550: Add GPU nodes

Add the required nodes to support the A740 GPU.

Signed-off-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Tested-by: Neil Armstrong <neil.armstrong@linaro.org> # on SM8550-QRD
Link: https://lore.kernel.org/r/20231127-topic-a7xx_dt-v2-3-2a437588e563@linaro.org


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