If UEFI is enabled in U-Boot, we want it to conform to the UEFI specification. This requires enabling the boot manager boot method. Reported-by: E Shattow <lucent@gmail.com> Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com> Reviewed-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>