powerpc/85xx: Updates to P4080DS device tree

* Added BSD dual-license
* Moved mpic-parent to root so we dont need to duplicate everywhere
* Added next level cache from L2 to CPC
* Moved to 4-cell MPIC interrupt properties
* Added 3 MSI banks
* Added numerous missing nodes: soc-sram-error, guts, pins, clockgen,
  rcpm, sfp, serdes, etc.
* Reworked PCIe interrupts to be at virtual bridge level

Signed-off-by: Kumar Gala <galak@kernel.crashing.org>