drm/nv50: rename INVALID_QUERY_OR_TEXTURE error to INVALID_OPERATION

Current name is misleading, because this error can be triggered by other
conditions, like changing STRMOUT parameter without disabling STRMOUT first.

Signed-off-by: Marcin Slusarz <marcin.slusarz@gmail.com>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>