drm/nouveau/mmu: make a couple of functions static

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

drivers/gpu/drm/nouveau/nvkm/subdev/mmu/base.c

@@ -61,7 +61,7 @@ nvkm_mmu_ptp_put(struct nvkm_mmu *mmu, bool force, struct nvkm_mmu_pt *pt)
 	kfree(pt);
 }
 
-struct nvkm_mmu_pt *
+static struct nvkm_mmu_pt *
 nvkm_mmu_ptp_get(struct nvkm_mmu *mmu, u32 size, bool zero)
 {
 	struct nvkm_mmu_pt *pt;

drivers/gpu/drm/nouveau/nvkm/subdev/mmu/tu102.c

@@ -27,7 +27,7 @@
 
 #include <nvif/class.h>
 
-const u8 *
+static const u8 *
 tu102_mmu_kind(struct nvkm_mmu *mmu, int *count, u8 *invalid)
 {
 	static const u8