defconfig: firefly-rk3399: fix pinctrl config option

The option is named PINCTRL_ROCKCHIP_RK3399 not ROCKCHIP_RK3399_PINCTRL.
Set the correct option.

Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Acked-by: Simon Glass <sjg@chromium.org>
1 file changed