HID: fix A4Tech RP-649 horizontal scrollwheel

Enable fix for their horizontal scroll wheel behaviour, associate
it with B8 hack.

Signed-off-by: Lech Perczak <lech.perczak@multivision.pl>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
diff --git a/drivers/hid/hid-ids.h b/drivers/hid/hid-ids.h
index 85c6d13..6c7c671 100644
--- a/drivers/hid/hid-ids.h
+++ b/drivers/hid/hid-ids.h
@@ -25,6 +25,7 @@
 #define USB_VENDOR_ID_A4TECH		0x09da
 #define USB_DEVICE_ID_A4TECH_WCP32PU	0x0006
 #define USB_DEVICE_ID_A4TECH_X5_005D	0x000a
+#define USB_DEVICE_ID_A4TECH_RP_649	0x001a
 
 #define USB_VENDOR_ID_AASHIMA		0x06d6
 #define USB_DEVICE_ID_AASHIMA_GAMEPAD	0x0025