ARM: dts: qcom: sdx65: Enable ARM SMMU

Add a node for the ARM SMMU found in the SDX65.

Signed-off-by: Rohit Agarwal <quic_rohiagar@quicinc.com>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/1649670615-21268-6-git-send-email-quic_rohiagar@quicinc.com