[U-Boot] rockchip: rk3399: enable SPL_SERIAL_SUPPORT and SPL_DRIVERS_MISC via Kconfig

[Philipp Tomsich]

> SPL_SERIAL_SUPPORT and SPL_DRIVERS_MISC were previously enabled through
> rk3399_common.h.  This change implies these options through Kconfig.
> 
> These need to always be active for the RK3399, as follows:
>  - SPL_SERIAL_SUPPORT is needed to pass the SPL build
>  - SPL_DRIVERS_MISC is needed to pass the SPL build
> 
> Signed-off-by: Philipp Tomsich <philipp.tomsich at theobroma-systems.com>
> ---
> 
>  arch/arm/mach-rockchip/Kconfig  | 2 ++
>  include/configs/rk3399_common.h | 2 --
>  2 files changed, 2 insertions(+), 2 deletions(-)
> 

Acked-by: Philipp Tomsich <philipp.tomsich at theobroma-systems.com>