arm64: dts: qcom: sa8155p-adp: Move mtl nodes into ethernet node

The mtl nodes aren't evaluated unless they're under the node with the
compatible. Move them so they're now evaluated in case future patchsets
modify them incorrectly.

An example of this can be seen in the link.

Link: https://lore.kernel.org/linux-arm-msm/20230414145844.wyg6pt623pzqwh5l@halaney-x13s/


Signed-off-by: Andrew Halaney <ahalaney@redhat.com>
Reviewed-by: Brian Masney <bmasney@redhat.com>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20230501212446.2570364-5-ahalaney@redhat.com