drm/nouveau/disp/tu106: initial support

Appears to be compatible with TU104.
Signed-off-by: NBen Skeggs <bskeggs@redhat.com>

drivers/gpu/drm/nouveau/nvkm/engine/device/base.c

@@ -2488,6 +2488,7 @@ nv166_chipset = {
 	.therm = gp100_therm_new,
 	.timer = gk20a_timer_new,
 	.top = gk104_top_new,
+	.disp = tu104_disp_new,
 	.dma = gv100_dma_new,
 };