ACPI: docs: enumeration: Drop ugly ifdeffery from the examples

The ifdeffery around ACPI ID tables are ugly and in some cases
even less valuable than plain definitions. Drop them for good
to avoid spreading rather bad pattern.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>