drm/nouveau/dma: switch to instanced constructor

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
Reviewed-by: Lyude Paul <lyude@redhat.com>

drm/nouveau/dma: lookup objects with nvkm_object_search()

Custom code is no longer needed here.

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

drm/nouveau/dma: use rb_entry()

To make the code clearer, use rb_entry() instead of container_of() to
deal with rbtree.

Signed-off-by: Geliang Tang <geliangtang@gmail.com>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

drm/nouveau/core: remove pmc_enable argument from subdev ctor

These are now specified directly in the MC subdev.

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

drm/nouveau/dma: convert to new-style nvkm_engine

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

drm/nouveau/fifo: convert user classes to new-style nvkm_object

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

drm/nouveau/dma: convert user classes to new-style nvkm_object

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

drm/nouveau/dma: split user classes out from engine implementations

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