[U-Boot] [U-Boot, v6, 2/3] rockchip: firefly: Set the environment variable 'usbkbd' to the stdin

[Philipp Tomsich]

> Add the 'usbkbd' environment variable to the 'stdin', the contents of
> the keyboard input can be auto-displayed on the serial terminal,so
> you don't need to manually set the environment variable 'stdin'.
> 
> Signed-off-by: Leo Wen <leo.wen at rock-chips.com>
> Acked-by: Philipp Tomsich <philipp.tomsich at theobroma-systems.com>
> ---
>  include/configs/firefly-rk3288.h | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 

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