[U-Boot] [RFC PATCH] spl: Add option SPL_PAYLOAD

[York Sun]

On 06/14/2018 02:39 PM, York Sun wrote:
> Some legacy boards use RAW image for SPL boot. Add Kconfig option
> SPL_PAYLOAD to set alternative image.
> 
> Signed-off-by: York Sun <york.sun at nxp.com>
> 
> ---
Applied to fsl-qoriq, awaiting upstream.

York