HID: wacom: Add new Intuos Pro Small (PTH-460) device IDs

commit 0627f3df

 upstream.

Add the new PIDs to wacom_wac.c to support the new model in the Intuos Pro series.

Signed-off-by: Ping Cheng <ping.cheng@wacom.com>
Tested-by: Aaron Armstrong Skomra <aaron.skomra@wacom.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Cc: Ping Cheng <pinglinux@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>