drm/nouveau/gpio: move on-reset intr disable-and-ack to common code

Re-uses the implementation's accessor functions rather than requiring
and init/fini implementation for each chipset.

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

diff --cc drivers/gpu/drm/nouveau/core/subdev/gpio/base.c
Simple merge

diff --cc drivers/gpu/drm/nouveau/core/subdev/gpio/nv10.c
Simple merge

diff --cc drivers/gpu/drm/nouveau/core/subdev/gpio/nv50.c
Simple merge

diff --cc drivers/gpu/drm/nouveau/core/subdev/gpio/nv92.c
Simple merge

diff --cc drivers/gpu/drm/nouveau/core/subdev/gpio/nvd0.c
Simple merge

diff --cc drivers/gpu/drm/nouveau/core/subdev/gpio/nve0.c
Simple merge

diff --cc drivers/gpu/drm/nouveau/core/subdev/gpio/priv.h
Simple merge