sandbox: building fails with GENERATE_ACPI_TABLE=y, ACPIGEN=n

Hello Simon,

sandbox_defconfig with ACPIGEN=n fails to build.

We should not have two customizable symbols if the one cannot be set to no without the other.

* GENERATE_ACPI_TABLE * ACPIGEN

It should be possible to build the sandbox without ACPI tables to test UEFI binaries using device-trees. This requires to get test/dm/Makefile right.

Best regards

Heinrich