drm/nouveau/fb/gk20a: fix constructor call

The gf100 constructor should be called, otherwise we will allocate a
smaller object than expected. This was without effect so far because
gk20a did not allocate a page, but with gf100's page allocation moved
to the oneinit() hook this problem has become apparent.
Signed-off-by: Alexandre Courbot <acourbot@nvidia.com>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

drivers/gpu/drm/nouveau/nvkm/subdev/fb/gk20a.c

@@ -20,6 +20,7 @@
  * DEALINGS IN THE SOFTWARE.
  */
 #include "priv.h"
+#include "gf100.h"
 
 #include <core/memory.h>
 
@@ -42,5 +43,5 @@ gk20a_fb = {
 int
 gk20a_fb_new(struct nvkm_device *device, int index, struct nvkm_fb **pfb)
 {
-	return nvkm_fb_new_(&gk20a_fb, device, index, pfb);
+	return gf100_fb_new_(&gk20a_fb, device, index, pfb);
 }