drm/nouveau/gpio/gp104: initial support

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

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

@@ -2190,6 +2190,7 @@ nv134_chipset = {
 	.devinit = gm200_devinit_new,
 	.fb = gp104_fb_new,
 	.fuse = gm107_fuse_new,
+	.gpio = gk104_gpio_new,
 	.imem = nv50_instmem_new,
 	.mc = gp100_mc_new,
 	.mmu = gf100_mmu_new,