[U-Boot] [U-Boot, 35/36] rockchip: declear boot_devices in bootrom.h

[Philipp Tomsich]

> boot_devices may defined in soc file, and used in board file,
> we need to delear it in header file.
> 
> Signed-off-by: Kever Yang <kever.yang at rock-chips.com>
> ---
> 
>  arch/arm/include/asm/arch-rockchip/bootrom.h | 2 ++
>  1 file changed, 2 insertions(+)
> 

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