drm/nouveau/i2c: convert to new-style nvkm_subdev

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

drivers/gpu/drm/nouveau/include/nvif/device.h

@@ -56,7 +56,7 @@ u64  nvif_device_time(struct nvif_device *);
 #define nvxx_bar(a) nvxx_device(a)->bar
 #define nvxx_gpio(a) nvxx_device(a)->gpio
 #define nvxx_clk(a) nvxx_device(a)->clk
-#define nvxx_i2c(a) nvkm_i2c(nvxx_device(a))
+#define nvxx_i2c(a) nvxx_device(a)->i2c
 #define nvxx_therm(a) nvkm_therm(nvxx_device(a))
 
 #include <core/device.h>