arm: dts: fsl-ls1088a: sync PCIe controller definition with Linux
This moves the PCIe controller definitions under /soc and adopts
the same bindings (fsl,ls1088a-pcie) as Linux. Previously,
the format was different between the two versions.
Signed-off-by: Mathew McBride <matt@traverse.com.au> Reviewed-by: Peng Fan <peng.fan@nxp.com> Signed-off-by: Peng Fan <peng.fan@nxp.com> Reviewed-by: Ioana Ciornei <ioana.ciornei@nxp.com> Tested-by: Ioana Ciornei <ioana.ciornei@nxp.com> # on LS1088A-RDB