[Nouveau] PM + Init work

[Roy Spliet]

Following a series of three patches, two of which have been sitting in my tree
for a while, the third is the result of some inspection of an NV134 BIOS that
seems to use the 0xaf upcode to upload training patterns. Please test!

Roy

Ps. Sorry they come from yet another e-mail address. My previous provider, 
eclipso, actively blocks users of git send-email. Inquiries fall on deaf
ears, hence I consider them hostile towards OSS developers.