ACPI: event: Remove leftover ACPICA debug code

After commit (ff491a73 "netlink: change return-value logic of
netlink_broadcast()"), ACPI_DEBUG_PRINT() was removed from event.c,
so the ACPICA debug code is not used, remove it.

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