arm: dts: fsl-ls1088a: syncronise fsl-mc definition with Linux

arm: dts: fsl-ls1088a: syncronise fsl-mc definition with Linux

This moves the fsl-mc device tree definition under the /soc
node, as well as adding interrupt and IOMMU definitions that
were not in U-Boot before.

There are slight differences between the two bindings
as we add a "simple-mfd" compatible to function
under U-Boot's driver model.

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