[U-Boot] [U-Boot,v2,1/5] clk: add clk_set_parent()

[Philipp Tomsich]

> Clocks may support multiple parents: this change introduces an
> optional operation on the clk-uclass to set a clock's parent.
> 
> Signed-off-by: Philipp Tomsich <philipp.tomsich at theobroma-systems.com>
> Tested-by: David Wu <david.wu at rock-chips.com>
> ---
> 
> Changes in v2:
> - Fixed David's email address.
> 
>  drivers/clk/clk-uclass.c | 12 ++++++++++++
>  include/clk-uclass.h     |  8 ++++++++
>  include/clk.h            | 11 +++++++++++
>  3 files changed, 31 insertions(+)
> 

Applied to u-boot-rockchip, thanks!