drm/nouveau/cipher: remove dependence on namedb/engctx lookup

static void

g84_cipher_intr(struct nvkm_subdev *subdev)

{

	struct nvkm_fifo *fifo = nvkm_fifo(subdev);

	struct nvkm_engine *engine = nv_engine(subdev);

	struct nvkm_object *engctx;

	struct nvkm_engine *cipher = (void *)subdev;

	struct nvkm_device *device = cipher->subdev.device;

	struct nvkm_fifo *fifo = device->fifo;

	struct nvkm_fifo_chan *chan;

	u32 stat = nvkm_rd32(device, 0x102130);

	u32 mthd = nvkm_rd32(device, 0x102190);

	u32 data = nvkm_rd32(device, 0x102194);

	u32 inst = nvkm_rd32(device, 0x102188) & 0x7fffffff;

	unsigned long flags;

	char msg[128];

	int chid;

	engctx = nvkm_engctx_get(engine, inst);

	chid   = fifo->chid(fifo, engctx);

	chan = nvkm_fifo_chan_inst(fifo, (u64)inst << 12, &flags);

	if (stat) {

		nvkm_snprintbf(msg, sizeof(msg), g84_cipher_intr_mask, stat);

		nvkm_error(subdev,  "%08x [%s] ch %d [%010llx %s] "

				    "mthd %04x data %08x\n",

			   stat, msg, chid, (u64)inst << 12,

			   nvkm_client_name(engctx), mthd, data);

			   stat, msg, chan ? chan->chid : -1, (u64)inst << 12,

			   nvkm_client_name(chan), mthd, data);

	}

	nvkm_fifo_chan_put(fifo, flags, &chan);

	nvkm_wr32(device, 0x102130, stat);

	nvkm_wr32(device, 0x10200c, 0x10);

	nvkm_engctx_put(engctx);

}

static int