drm/nouveau/debugfs: rename functions to indicate they are used inside drm

We will need our own debugfs_init and cleanup functions, because
nouveau_drm isn't ready while the DRM ones are called by DRM.

Signed-off-by: Karol Herbst <nouveau@karolherbst.de>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
diff --git a/drivers/gpu/drm/nouveau/nouveau_debugfs.c b/drivers/gpu/drm/nouveau/nouveau_debugfs.c
index 598c722..5085c98 100644
--- a/drivers/gpu/drm/nouveau/nouveau_debugfs.c
+++ b/drivers/gpu/drm/nouveau/nouveau_debugfs.c
@@ -81,7 +81,7 @@
 }
 
 int
-nouveau_debugfs_init(struct drm_minor *minor)
+nouveau_drm_debugfs_init(struct drm_minor *minor)
 {
 	int i, ret;
 
@@ -99,7 +99,7 @@
 }
 
 void
-nouveau_debugfs_takedown(struct drm_minor *minor)
+nouveau_drm_debugfs_cleanup(struct drm_minor *minor)
 {
 	int i;