Sort the soc entries in the dts by address and use dtc labels whenever
possible.

Adjust the DTS files, the OpenMesh A42 is actually an IPQ4018 and not an
IPQ4019.

Signed-off-by: Sven Eckelmann <sven.eckelmann@openmesh.com>
Signed-off-by: Christian Lamparter <chunkeey@gmail.com>