AcpiDebugFeaturePkg: Modules are DRIVER_ACPITABLE

Fix assert when trying to retrieve the ACPI table.

However, now a second bug can be seen: SMM module also calls the DXE
module's notification, causing a second ACPI table to be installed with
colliding definitions.

Cc: Eric Dong <eric.dong@intel.com>
Cc: Liming Gao <gaoliming@byosoft.com.cn>
Signed-off-by: Benjamin Doron <benjamin.doron00@gmail.com>
Reviewed-by: Nate DeSimone <nathaniel.l.desimone@intel.com>