drm/nouveau: Convert to struct drm_crtc_helper_funcs.get_scanout_position()

The callback struct drm_driver.get_scanout_position() is deprecated in
favor of struct drm_crtc_helper_funcs.get_scanout_position(). Convert
nouveau over.

v4:
	* add argument names in function declaration

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Ben Skeggs <bskeggs@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200123135943.24140-9-tzimmermann@suse.de