[U-Boot] [U-Boot, v3, 1/7] efi_loader: Update description of internal efi_mem_carve_out

[Alexander Graf]

> In 74c16acce30bb882ad5951829d8dafef8eea564c the return values where
> changed, but the description was kept.
> 
> Signed-off-by: Stefan Brüns <stefan.bruens at rwth-aachen.de>
> Reviewed-by: Alexander Graf <agraf at suse.de>

Thanks, applied to