efi_loader: PARTITION_UUIDS should be optional

In the current implementation, partition table support (either GPT or DOS)
is not mandatory. So CONFIG_PARTITION_UUIDS should not be enabled
(selected) unconditionally.

Fixes: commit 17f8cda5 ("efi_loader: set partition GUID in device path for SIG_TYPE_GUID")
Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
Reviewed-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>