[U-Boot] [U-Boot,v6,10/10] smbios: Provide serial number

[Alexander Graf]

> If the system has a valid "serial#" environment variable set (which boards that
> can find it out programatically set automatically), use that as input for the
> serial number and UUID fields in the SMBIOS tables.
> 
> Signed-off-by: Alexander Graf <agraf at suse.de>
> Reviewed-by: Bin Meng <bmeng.cn at gmail.com>
> Reviewed-by: Simon Glass <sjg at chromium.org>

Thanks, applied to