[U-Boot] rockchip: clk: rk3399: change extract_bits to bitfield_extract

[Philipp Tomsich]

> The RK3399 clk driver still has a left-over use of extract_bits, which
> can be replaced by using bitfield_extract from include/bitfield.h.
> This rewrites the invocation to use the shared function.
> 
> Signed-off-by: Philipp Tomsich <philipp.tomsich at theobroma-systems.com>
> ---
> 
>  drivers/clk/rockchip/clk_rk3399.c | 8 ++------
>  1 file changed, 2 insertions(+), 6 deletions(-)
> 

Applied to u-boot-rockchip, thanks!