HID: Recognize "Digitizer" as a valid input application

HID: Recognize "Digitizer" as a valid input application

"Digitizer" is a generic usage that may be used by various devices but
which is particularly used by non-display pen tablets. This patch adds the
usage to the list of values matched by the IS_INPUT_APPLICATION() macro
that determines if an input device should be allocated or not.

Signed-off-by: Jason Gerecke <jason.gerecke@wacom.com>
Reviewed-by: Ping Cheng <ping.cheng@wacom.com>
Link: https://lore.kernel.org/r/20221019151832.44522-1-jason.gerecke@wacom.com
Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>