[U-Boot] [U-Boot,3/4] rockchip: Add a sound driver

[Philipp Tomsich]

> Add a sound driver for rk3288 supporting chromebook_jerry. This uses the
> I2S driver, and existing audio codec and the clock/pinmux support.
> 
> Signed-off-by: Simon Glass <sjg at chromium.org>
> ---
> 
>  drivers/sound/Makefile         |   2 +-
>  drivers/sound/rockchip_sound.c | 132 +++++++++++++++++++++++++++++++++
>  2 files changed, 133 insertions(+), 1 deletion(-)
>  create mode 100644 drivers/sound/rockchip_sound.c
> 

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