[U-Boot] efi_loader: Revert device_handle to disk after net boot

[Alexander Graf]

> When you boot an efi payload from network, then exit that payload
> and load another payload from disk afterwords, the disk payload will
> currently see the network device as its boot path.
> 
> This breaks grub2 for example which tries to find its modules based
> on the path it was loaded from.
> 
> This patch fixes that issue by always reverting to disk paths if we're
> not in the network boot. That way the data structures after a network
> boot look the same as before.
> 
> Signed-off-by: Alexander Graf <agraf at suse.de>

Thanks, applied to efi-next

Alex