drm/nouveau/gr/nv3x: add 0x0597 kelvin 3d class support

Tested on a NV34. There are reports of this also working on the other
nv3x chips. Largely useful for testing software written for NV2x without
having the actual hardware available.
Signed-off-by: Ilia Mirkin <imirkin@alum.mit.edu>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

drivers/gpu/drm/nouveau/nvkm/engine/gr/nv30.c

@@ -187,6 +187,7 @@ nv30_gr = {
 		{ -1, -1, 0x038a, &nv04_gr_object }, /* ifc (nv30) */
 		{ -1, -1, 0x039e, &nv04_gr_object }, /* swzsurf (nv30) */
 		{ -1, -1, 0x0397, &nv04_gr_object }, /* rankine */
+		{ -1, -1, 0x0597, &nv04_gr_object }, /* kelvin */
 		{}
 	}
 };

drivers/gpu/drm/nouveau/nvkm/engine/gr/nv34.c

@@ -123,6 +123,7 @@ nv34_gr = {
 		{ -1, -1, 0x0389, &nv04_gr_object }, /* sifm (nv30) */
 		{ -1, -1, 0x038a, &nv04_gr_object }, /* ifc (nv30) */
 		{ -1, -1, 0x039e, &nv04_gr_object }, /* swzsurf (nv30) */
+		{ -1, -1, 0x0597, &nv04_gr_object }, /* kelvin */
 		{ -1, -1, 0x0697, &nv04_gr_object }, /* rankine */
 		{}
 	}

drivers/gpu/drm/nouveau/nvkm/engine/gr/nv35.c

@@ -124,6 +124,7 @@ nv35_gr = {
 		{ -1, -1, 0x038a, &nv04_gr_object }, /* ifc (nv30) */
 		{ -1, -1, 0x039e, &nv04_gr_object }, /* swzsurf (nv30) */
 		{ -1, -1, 0x0497, &nv04_gr_object }, /* rankine */
+		{ -1, -1, 0x0597, &nv04_gr_object }, /* kelvin */
 		{}
 	}
 };