UPSTREAM: HID: sony: Mark DS4 touchpad device as a pointer

Currently the DS4 touchpad device is neither classified as a direct
input device nor as a pointer device. It makes most sense to mark
it as a pointer device.

Signed-off-by: Roderick Colenbrander <roderick.colenbrander@sony.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
(cherry picked from commit b9f7d245e34b1f42b5389b015962a2f022d4ece2)

Bug: 111431828
Signed-off-by: Kim Low <kim-huei.low@sony.com>
Change-Id: Ia71cefee2eb90f0d46dd823a3cdf1be83d4cba59