[U-Boot] [U-Boot, 1/1] rockchip: spi: the symbol for Hertz is Hz

[Philipp Tomsich]

> fix typo
> 
> Signed-off-by: Heinrich Schuchardt <xypron.glpk at gmx.de>
> Acked-by: Philipp Tomsich <philipp.tomsich at theobroma-systems.com>
> Reviewed-by: Philipp Tomsich <philipp.tomsich at theobroma-systems.com>
> ---
>  drivers/spi/rk_spi.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 

Applied to u-boot-rockchip, thanks!