drm/nouveau/privring/ga10[024]: initial support

Appears to be compatible with GM200 code.
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

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

@@ -2657,6 +2657,7 @@ nv170_chipset = {
 	.name = "GA100",
 	.bios = nvkm_bios_new,
 	.devinit = ga100_devinit_new,
+	.ibus = gm200_ibus_new,
 	.mc = ga100_mc_new,
 	.pci = gp100_pci_new,
 };
@@ -2666,6 +2667,7 @@ nv172_chipset = {
 	.name = "GA102",
 	.bios = nvkm_bios_new,
 	.devinit = ga100_devinit_new,
+	.ibus = gm200_ibus_new,
 	.mc = ga100_mc_new,
 	.pci = gp100_pci_new,
 };
@@ -2675,6 +2677,7 @@ nv174_chipset = {
 	.name = "GA104",
 	.bios = nvkm_bios_new,
 	.devinit = ga100_devinit_new,
+	.ibus = gm200_ibus_new,
 	.mc = ga100_mc_new,
 	.pci = gp100_pci_new,
 };