[U-Boot] [U-Boot, RESEND, 1/2] rockchip: clk: rk3399: add clk_enable function and support USB HOST0/1

[Philipp Tomsich]

> The generic ehci-driver (ehci-generic.c) will try to enable the clocks
> listed in the DTSI. If this fails (e.g. due to clk_enable not being
> implemented in a driver and -ENOSYS being returned by the clk-uclass),
> the driver will bail our and print an error message.
> 
> This implements a minimal clk_enable for the RK3399 and supports the
> clocks mandatory for the EHCI controllers; as these are enabled by
> default we simply return success.
> 
> Signed-off-by: Philipp Tomsich <philipp.tomsich at theobroma-systems.com>
> Reviewed-by: Simon Glass <sjg at chromium.org>
> ---
> 
>  drivers/clk/rockchip/clk_rk3399.c | 15 +++++++++++++++
>  1 file changed, 15 insertions(+)
> 

Applied to u-boot-rockchip, thanks!