drm/nouveau/dmaobj/ga10[24]: initial support

Appears to be compatible with GV100 code, and not required on GA100, as
it shouldn't have display.
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

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

@@ -2684,6 +2684,7 @@ nv172_chipset = {
 	.mmu = tu102_mmu_new,
 	.pci = gp100_pci_new,
 	.timer = gk20a_timer_new,
+	.dma = gv100_dma_new,
 };
 
 static const struct nvkm_device_chip
@@ -2701,6 +2702,7 @@ nv174_chipset = {
 	.mmu = tu102_mmu_new,
 	.pci = gp100_pci_new,
 	.timer = gk20a_timer_new,
+	.dma = gv100_dma_new,
 };
 
 static int