[U-Boot] [U-Boot,v2,3/8] efi: Fix missing EFIAPI specifiers

[Alexander Graf]

> These are missing in some functions. Add them to keep things consistent.
> 
> Signed-off-by: Simon Glass <sjg at chromium.org>
> Reviewed-by: Bin Meng <bmeng.cn at gmail.com>
> Reviewed-by: Alexander Graf <agraf at suse.de>

Thanks, applied to