arm64: dts: qcom: sm8550: add iris DT node

Add DT entries for the sm8550 iris decoder.

Since the firmware is required to be signed, only enable
on Qualcomm development boards where the firmware is
publicly distributed.

Signed-off-by: Dikshita Agarwal <quic_dikshita@quicinc.com>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
Link: https://lore.kernel.org/r/20250509-topic-sm8x50-upstream-iris-8550-dt-v4-1-22ced9179da3@linaro.org


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