dt-bindings: remoteproc: qcom: Add iommus property

Add iommus property to allow Q6 modem to boot on platforms which do
not have trustZone.

Signed-off-by: Sibi Sankar <sibis@codeaurora.org>
Signed-off-by: Sai Prakash Ranjan <saiprakash.ranjan@codeaurora.org>
Acked-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/561e9b42b8665fc9712fdb40a525ab8871fcbdac.1587407458.git.saiprakash.ranjan@codeaurora.org


Signed-off-by: Will Deacon <will@kernel.org>