[Nouveau] Preparations for Fermi DRAM clock changes

[Roy Spliet]

No, no, these will not implement Fermi reclocking. This set of patches
contains some of the preparatory work that I deem stable enough to
move upstream. Notable changes
- Training pattern upload routines from GK104+ now shared with GT215+
- Timing calculation for Fermi
- GDDR5 MR calculation from VBIOS timing table v1.0. Also useful for that
  pesky GT 240.
- A routine to translate a VBIOS init script to a set of memx writes.
  Used by both "that GT 240" and Fermi.
- Misc clean-up

Testers should expect no changes in behaviour before/after. Keen eyes
can double-check on their Tesla and Fermi GDDR5 graphics cards that
training patterns are uploaded on boot.