On rk3399 we'd like to be able to properly set corecfg registers in the
Arasan SDHCI component.  Specify the syscon to enable that.
Signed-off-by: Douglas Anderson <dianders@chromium.org>
Tested-by: Heiko Stuebner <heiko@sntech.de>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>