arm64: dts: qcom: x1e80100-dell-latitude-7455: Enable IRIS

arm64: dts: qcom: x1e80100-dell-latitude-7455: Enable IRIS

Enable IRIS to allow using the hardware-accelerated video codecs. The
firmware is not upstream in linux-firmware yet, so users need to copy it
from Windows to qcom/x1e80100/dell/latitude-7455/qcvss8380.mbn (just like
GPU/ADSP/CDSP firmware).

Signed-off-by: Stephan Gerhold <stephan.gerhold@linaro.org>
Reviewed-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org>
Link: https://lore.kernel.org/r/20250915-x1e-iris-dt-v2-8-1f928de08fd4@linaro.org
Signed-off-by: Bjorn Andersson <andersson@kernel.org>