Add SCFG MSI dts node and add msi-parent property to PCIe dts node
that points to the corresponding MSI node.
Signed-off-by: Minghuan Lian <Minghuan.Lian@nxp.com>
Tested-by: Alexander Stein <alexander.stein@systec-electronic.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>