drm/nouveau/mmu: rename from vmmgr (no binary change)

Switch to NVIDIA's name for the device.

The namespace of NVKM is being changed to nvkm_ instead of nouveau_,
which will be used for the DRM part of the driver.  This is being
done in order to make it very clear as to what part of the driver a
given symbol belongs to, and as a minor step towards splitting the
DRM driver out to be able to stand on its own (for virt).

Because there's already a large amount of churn here anyway, this is
as good a time as any to also switch to NVIDIA's device and chipset
naming to ease collaboration with them.

A comparison of objdump disassemblies proves no code changes.

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
diff --git a/drivers/gpu/drm/nouveau/nouveau_chan.c b/drivers/gpu/drm/nouveau/nouveau_chan.c
index aff9099..8030253 100644
--- a/drivers/gpu/drm/nouveau/nouveau_chan.c
+++ b/drivers/gpu/drm/nouveau/nouveau_chan.c
@@ -88,7 +88,7 @@
 		     u32 handle, u32 size, struct nouveau_channel **pchan)
 {
 	struct nouveau_cli *cli = (void *)nvif_client(&device->base);
-	struct nouveau_vmmgr *vmm = nvkm_vmmgr(device);
+	struct nouveau_mmu *mmu = nvkm_mmu(device);
 	struct nv_dma_v0 args = {};
 	struct nouveau_channel *chan;
 	u32 target;
@@ -136,7 +136,7 @@
 		args.target = NV_DMA_V0_TARGET_VM;
 		args.access = NV_DMA_V0_ACCESS_VM;
 		args.start = 0;
-		args.limit = cli->vm->vmm->limit - 1;
+		args.limit = cli->vm->mmu->limit - 1;
 	} else
 	if (chan->push.buffer->bo.mem.mem_type == TTM_PL_VRAM) {
 		if (device->info.family == NV_DEVICE_INFO_V0_TNT) {
@@ -165,7 +165,7 @@
 			args.target = NV_DMA_V0_TARGET_VM;
 			args.access = NV_DMA_V0_ACCESS_RDWR;
 			args.start = 0;
-			args.limit = vmm->limit - 1;
+			args.limit = mmu->limit - 1;
 		}
 	}
 
@@ -281,7 +281,7 @@
 {
 	struct nvif_device *device = chan->device;
 	struct nouveau_cli *cli = (void *)nvif_client(&device->base);
-	struct nouveau_vmmgr *vmm = nvkm_vmmgr(device);
+	struct nouveau_mmu *mmu = nvkm_mmu(device);
 	struct nouveau_software_chan *swch;
 	struct nv_dma_v0 args = {};
 	int ret, i;
@@ -294,7 +294,7 @@
 			args.target = NV_DMA_V0_TARGET_VM;
 			args.access = NV_DMA_V0_ACCESS_VM;
 			args.start = 0;
-			args.limit = cli->vm->vmm->limit - 1;
+			args.limit = cli->vm->mmu->limit - 1;
 		} else {
 			args.target = NV_DMA_V0_TARGET_VRAM;
 			args.access = NV_DMA_V0_ACCESS_RDWR;
@@ -312,7 +312,7 @@
 			args.target = NV_DMA_V0_TARGET_VM;
 			args.access = NV_DMA_V0_ACCESS_VM;
 			args.start = 0;
-			args.limit = cli->vm->vmm->limit - 1;
+			args.limit = cli->vm->mmu->limit - 1;
 		} else
 		if (chan->drm->agp.stat == ENABLED) {
 			args.target = NV_DMA_V0_TARGET_AGP;
@@ -324,7 +324,7 @@
 			args.target = NV_DMA_V0_TARGET_VM;
 			args.access = NV_DMA_V0_ACCESS_RDWR;
 			args.start = 0;
-			args.limit = vmm->limit - 1;
+			args.limit = mmu->limit - 1;
 		}
 
 		ret = nvif_object_init(chan->object, NULL, gart,