[U-Boot] [U-Boot, 2/2] rockchip: ram: update license for sdram driver

[Philipp Tomsich]

> Rockchip may use this sdram copy of source code for both open source
> and internal project, update the license to use both GPL2.0+ and
> BSD-3 Clause.
> 
> Signed-off-by: Kever Yang <kever.yang at rock-chips.com>
> ---
> 
>  drivers/ram/rockchip/sdram_rk3128.c | 2 +-
>  drivers/ram/rockchip/sdram_rk3188.c | 2 +-
>  drivers/ram/rockchip/sdram_rk322x.c | 2 +-
>  drivers/ram/rockchip/sdram_rk3288.c | 2 +-
>  drivers/ram/rockchip/sdram_rk3328.c | 2 +-
>  drivers/ram/rockchip/sdram_rk3399.c | 2 +-
>  6 files changed, 6 insertions(+), 6 deletions(-)
> 

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