At present this enum is only available to rk3288. Move it so that other rockchip SoCs can access it. It is needed for the SPL GPIO driver for rk3999 in a later patch. Also adjust the enum name to lower case. Signed-off-by: Simon Glass <sjg@chromium.org> Reviewed-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>