drm: report consistent errors when checking syncobj capibility

We've been somewhat inconsistent when adding the new ioctl and
returned ENODEV instead of EOPNOTSUPPORTED upon failing the syncobj
capibility.

Signed-off-by: Lionel Landwerlin <[e-mail]>
Fixes: ea569910cbab98 ("drm/syncobj: add transition iotcls between binary and timeline v2")
Fixes: 01d6c357837918 ("drm/syncobj: add support for timeline point wait v8")
Cc: Dave Airlie <[e-mail]>
Cc: Christian König <[e-mail]>
Cc: Chunming Zhou <[e-mail]>
Reviewed-by: Christian König <[e-mail]> for the series.
Reviewed-by: Chunming Zhou <[e-mail]>
Signed-off-by: Dave Airlie <[e-mail]>
Link: https://patchwork.freedesktop.org/patch/msgid/[e-mail]

drivers/gpu/drm/drm_syncobj.c

···
 	int ret;
 
 	if (!drm_core_check_feature(dev, DRIVER_SYNCOBJ))
-		return -ENODEV;
+		return -EOPNOTSUPP;
 
 	if (args->pad)
 		return -EINVAL;
···
 	int ret = 0;
 
 	if (!drm_core_check_feature(dev, DRIVER_SYNCOBJ))
-		return -ENODEV;
+		return -EOPNOTSUPP;
 
 	if (args->flags & ~(DRM_SYNCOBJ_WAIT_FLAGS_WAIT_ALL |
 			    DRM_SYNCOBJ_WAIT_FLAGS_WAIT_FOR_SUBMIT |