HID: multitouch: fix maxcontacts problem on GeneralTouch

Fix maxcontacts problem for PWT GeneralTouch multi-touchscreen.

Our device didn't contain HID_DG_CONTACTMAX usage. This usage use to describe
touchscreen's maxcontacts for hid-multitouch.c to get maxcontacts automatic. We
fix the device that driver can get maxcontact from our device, hence it doesn't
need .maxcontact=10. Now there is just one device class can fix all our PWT
touchscreen.

Signed-off-by: Xianhan Yu <aroundight77@gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

drivers/hid/hid-multitouch.c

@@ -210,8 +210,7 @@ static struct mt_class mt_classes[] = {
 	},
 	{ .name	= MT_CLS_GENERALTOUCH_PWT_TENFINGERS,
 		.quirks	= MT_QUIRK_NOT_SEEN_MEANS_UP |
-			MT_QUIRK_SLOT_IS_CONTACTNUMBER,
-		.maxcontacts = 10
+			MT_QUIRK_SLOT_IS_CONTACTNUMBER
 	},
 
 	{ .name = MT_CLS_FLATFROG,