rockchip: rk3328: nanopi-r2s: Use the sdcard for the env

The NanoPi-R2S doesn't have eMMC so use the sdcard as the device
to save the environment variables

Signed-off-by: Emmanuel Vadot <manu@FreeBSD.org>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>
1 file changed