ACPI: APD: Clean up header file include statements

Make the included header files appear in the alphabetical order and
remove the unnecessary header file inclusions.

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