pci: layerscape: Fixup PCIe EP mode DT nodes for LX2160A rev2

LX2160A rev2 uses different PCIe controller, so EP mode DT
nodes also need to be fixed up.

Signed-off-by: Hou Zhiqiang <Zhiqiang.Hou@nxp.com>
Reviewed-by: Priyanka Jain <priyanka.jain@nxp.com>