drm/nouveau/i2c: use a custom bitbanging delay for the adt7473

This patch adds a way to define a custom delay when scanning for i2c devices
because the adt7473 sometimes doesn't like the default bitbanging udelay.

Signed-off-by: Martin Peres <martin.peres@labri.fr>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

diff --cc drivers/gpu/drm/nouveau/core/include/subdev/i2c.h
Simple merge

diff --cc drivers/gpu/drm/nouveau/core/subdev/i2c/base.c
Simple merge

diff --cc drivers/gpu/drm/nouveau/core/subdev/therm/ic.c
Simple merge

diff --cc drivers/gpu/drm/nouveau/dispnv04/dfp.c
Simple merge

diff --cc drivers/gpu/drm/nouveau/dispnv04/tvnv04.c
Simple merge