HID: usbhid: fix sis quirk

Since commit 765e5fbd merged the sis quirk,
then USB_VENDOR_ID_SIS2_TOUCH remains undefined.

Reported-by: Fengguang Wu <fengguang.wu@intel.com>
Signed-off-by: Wanlong Gao <gaowanlong@cn.fujitsu.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>