Bug#790690: [Bug 94757] powerpc64 & 64Kb kernel pagesize not working with nouveau

[Mathieu Malaterre]

Control: reassign -1 src:xserver-xorg-video-nouveau 1:1.0.12-1

Since nouveau people are currently considering that not supporting 64K
page is a bug. It is time to re-affect the bug to nouveau instead of
src:linux.