drm/nouveau/disp/dp: split link config/power into two steps

We want to be able to power down the lanes for DPMS off.

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

diff --cc drivers/gpu/drm/nouveau/core/engine/disp/dport.c
Simple merge

diff --cc drivers/gpu/drm/nouveau/core/engine/disp/nv50.h
Simple merge

diff --cc drivers/gpu/drm/nouveau/core/engine/disp/outpdp.h
Simple merge

diff --cc drivers/gpu/drm/nouveau/core/engine/disp/piornv50.c
Simple merge

diff --cc drivers/gpu/drm/nouveau/core/engine/disp/sornv94.c
Simple merge

diff --cc drivers/gpu/drm/nouveau/core/engine/disp/sornvd0.c
Simple merge