use generic DMA mapping code in powerpc V4

[Christian Zigotzky]

On 12 December 2018 at 3:15PM, Christoph Hellwig wrote:
 > Thanks for bisecting.  I've spent some time going over the conversion
 > but can't really pinpoint it.  I have three little patches that switch
 > parts of the code to the generic version.  This is on top of the
 > last good commmit (977706f9755d2d697aa6f45b4f9f0e07516efeda).
 >
 > Can you check with whіch one things stop working?

Hello Christoph,

Great news! All your patches work!

I tested all your patches (including the patch '0004-alloc-free.patch' 
today) and the PASEMI onboard ethernet works and the P5020 board boots 
without any problems. Thank you for your work!
I have a few days off. That means, I will work less and only for the 
A-EON first level Linux support. I can test again on Thursday next week.

Have a nice weekend!

Cheers,
Christian