cmd/load: support uploading EFI binary via UART

When uploading an EFI binary via the UART we have to call
efi_set_bootdev() or we won't be able to execute it.

Put the includes into alphabetic order.

Fixes: 5f59518a ("efi_loader: setting boot device")
Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>