drm/nouveau/i2c: properly hand aux reply back to caller, and only retry on defer

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/anx9805.c
Simple merge

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

diff --cc drivers/gpu/drm/nouveau/core/subdev/i2c/nv94.c
Simple merge