Update API names for layerscape gen4 fixup.
Suffix layerscape_gen4 fixup API names with _ls_gen4.
This is required to organize device tree fixup in common, layerscape
and layerscape_gen4 specific code.
Signed-off-by: NWasim Khan <wasim.khan@nxp.com>
Reviewed-by: NPriyanka Jain <priyanka.jain@nxp.com>

Add the infrastructure for Layerscape SoCs PCIe Gen4 controller
to update device tree nodes to convey SMMU stream IDs in the
device tree.
Signed-off-by: NHou Zhiqiang <Zhiqiang.Hou@nxp.com>
Reviewed-by: NPrabhakar Kushwaha <prabhakar.kushwaha@nxp.com>