use generic DMA mapping code in powerpc V4

[Michael Ellerman]

Christoph Hellwig <hch at lst.de> writes:

> FYI, given that we are one week before the expected 4.20 release
> date and I haven't found the bug plaging Christians setups I think
> we need to defer most of this to the next merge window.

OK, sorry I couldn't help. I tried powering up my pasemi board last week
but it just gives me a couple of status leds and nothing else, the fan
never spins up.

> I'd still like to get a few bits in earlier, which I will send out
> separately now.

OK.

cheers