S2885 support.

[ron minnich]

can you send me your config? or better yet, your diff, which I will commit 
and then start testing. 

I just this morning got the ARIMA HDAMA working with a bproc phase 1 boot, 
it was a bit of hackery needed with the kernel to tell it what kind of irq 
router it had. 

I wonder how the normal bios handles the PIRQ? getpir returns one that is 
clearly bogus. I guess linux never tries to use it? But a lilo boot of 
phase 1 reveals that it does find some sort of pirq table, and does 
something I can't figure out ... oh well that's for later.

ron