Document the iommus property for QCOM Geni SE.
Signed-off-by: NCaleb Connolly <caleb@connolly.tech>
Acked-by: NRob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20210408161953.26298-4-caleb@connolly.techSigned-off-by: NBjorn Andersson <bjorn.andersson@linaro.org>