arm64: dts: qcom: msm8998: Add disabled support for LPASS iommu for Q6

Add support for the LPASS (Q6) SMMU and keep it disabled as this is
used only when the audio DSP is present and used, which is not
mandatory to have.

It is expected for board-specific device-trees to enable this node
if supported.

Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@somainline.org>
Signed-off-by: Marc Gonzalez <mgonzalez@freebox.fr>
Link: https://lore.kernel.org/r/20240814-lpass-v1-3-a5bb8f9dfa8b@freebox.fr


[bjorn: s/iface/bus in clock-names, to match binding]
Signed-off-by: Bjorn Andersson <andersson@kernel.org>