[U-Boot] [U-Boot, v4, 02/16] efi: Update some comments related to smbios tables

[Alexander Graf]

> Clarify the operation of this code with some additional comments.
> 
> Signed-off-by: Simon Glass <sjg at chromium.org>
> Reviewed-by: Heinrich Schuchardt <xypron.glpk at gmx.de>

Thanks, applied to efi-next

Alex