pci: kconfig: layerscape: Change LX2162A PCIe node compatible string

pci: kconfig: layerscape: Change LX2162A PCIe node compatible string

LX2162A is not like LX2160A which has different PCIe controller
in rev1 and rev2 silicon. It supports only one configuration of
PCIe controller, which is same as LS2088A. So update PCIe
compatible string same as LS2088A.

Signed-off-by: Hou Zhiqiang <Zhiqiang.Hou@nxp.com>
Reviewed-by: Wasim Khan <wasim.khan@nxp.com>
Tested-by: Wasim Khan <wasim.khan@nxp.com>
Reviewed-by: Priyanka Jain <priyanka.jain@nxp.com>