drm/gk104-/fb/ram: use parsed timing data in mr routines

All the other chipsets should be moved over to this too.  It's not needed
yet for the upcoming commits, so left this step as it'll conflict badly
with Roy's GT21x reclocking work.

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

diff --cc drivers/gpu/drm/nouveau/core/subdev/fb/gddr5.c
Simple merge

diff --cc drivers/gpu/drm/nouveau/core/subdev/fb/sddr3.c
Simple merge