ACPI: debugfs: Remove dead ACPICA debug code

The _COMPONENT and ACPI_MODULE_NAME() were not used even when
the debugfs.c was introduced, remove them.

Signed-off-by: Hanjun Guo <guohanjun@huawei.com>
[ rjw: Subject and changelog edits ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>