[PATCH ] powerpc: Add tsi108/9 and non standard mpic support

[Zang Roy-r61911]

> 
> I don't support IPI 2 and IPI 3, though it would be possible 
> to use the mailbox registers in a similar scheme. This 
> approach works, but I've not worked out how to cleanly 
> integrate this with the rest of the MPIC driver, and won't 
> have any time to do this in the near future.
> 
It might be better to deal with the tsi108/9 smp support
in a separate file. 
Roy