ACPI: HED: Drop unused ACPI_MODULE_NAME() definition

ACPI_MODULE_NAME() is only used by ACPICA message printing which in
turn is not used by the ACPI HED driver, so drop that definition from
there.

No functional impact.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Reviewed-by: Hanjun Guo <guohanjun@huawei.com>