arch: arm: dts: ls1046a: sync serial nodes with Linux

Pick up the serial node descriptions from Linux v6.3 for the ls1046ardb
and ls1046afrwy boards and their dependencies. Including the
fsl,qoriq-clockgen.h and arm-gic.h headers forces us to change the include
directives to explicitly go through the C preprocessor for all boards in
the ls1046a SoC family.

Signed-off-by: Camelia Groza <camelia.groza@nxp.com>
Signed-off-by: Peng Fan <peng.fan@nxp.com>
Reviewed-by: Peng Fan <peng.fan@nxp.com>