arm64: dts: qcom: sm8650: add iris DT node

arm64: dts: qcom: sm8650: add iris DT node

Add DT entries for the sm8650 iris decoder.

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

Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
Reviewed-by: Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
Link: https://lore.kernel.org/r/20250613-topic-sm8x50-upstream-iris-8650-dt-v4-1-35ea7952f2d2@linaro.org
Signed-off-by: Bjorn Andersson <andersson@kernel.org>