drm/nouveau: just pass gpio line to pwm_*, not entire gpio struct

We don't need more than the line id to determine the PWM controller, and
the GPIO interfaces are about to change somewhat.

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

diff --cc drivers/gpu/drm/nouveau/nouveau_drv.h
Simple merge

diff --cc drivers/gpu/drm/nouveau/nouveau_pm.c
Simple merge

diff --cc drivers/gpu/drm/nouveau/nouveau_pm.h
Simple merge

diff --cc drivers/gpu/drm/nouveau/nv40_pm.c
Simple merge

diff --cc drivers/gpu/drm/nouveau/nv50_pm.c
Simple merge