arm64: Layerscape: Survive LPI one-way reset workaround

The workaround of LPI one-way reset issue is broken by the series:
https://patchwork.ozlabs.org/project/uboot/list/?series=192398



This patch is to add DT node for GIC RD tables and create corresponding
reserved-memory node in kernel DT to fix it.

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