[RFC][PATCH 00/30] Rework FSL MPC85xx/Pxxxx device trees

Posting this to get any feedback and review while I cleanup commit messages
and the such.

The general idea is to split out the SoC and IP blocks into their own files
that can be included to build up a board level device tree.  This allows us
to reduce overall duplication and forward looking maintenance when updating
device nodes.

I've dropped numerous cases of compatiables that are of form "CHIP-IPname-.."
so as to use the basic IP dts includes as much as possible.  In general this
is areas that drivers have not typically utilized.

I've moved all the changed .dts to a 4-cell MPIC IRQ and made other cleanups
that I'll comment on in the commit mesages.

- k