efi_loader: require EFI boot manager for EBBR compliance

A system has to support booting via the boot manager to be EBBR compliant.
See the reference to variables Boot#### in the specification.

Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
Reviewed-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
1 file changed