HID: sony: Use DS4 MAC address as unique identifier on USB

The DS4 MAC address is reported as a unique identified when
using Bluetooth. For USB there is no unique identifier reported
yet, so use the MAC address.
Signed-off-by: Roderick Colenbrander <roderick.colenbrander@sony.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

drivers/hid/hid-sony.c

@@ -2390,6 +2390,12 @@ static int sony_check_add(struct sony_sc *sc)
 		}
 
 		memcpy(sc->mac_address, &buf[1], sizeof(sc->mac_address));
+
+		snprintf(sc->hdev->uniq, sizeof(sc->hdev->uniq),
+			"%02hhx:%02hhx:%02hhx:%02hhx:%02hhx:%02hhx",
+			sc->mac_address[5], sc->mac_address[4],
+			sc->mac_address[3], sc->mac_address[2],
+			sc->mac_address[1], sc->mac_address[0]);
 	} else if ((sc->quirks & SIXAXIS_CONTROLLER_USB) ||
 			(sc->quirks & NAVIGATION_CONTROLLER_USB)) {
 		buf = kmalloc(SIXAXIS_REPORT_0xF2_SIZE, GFP_KERNEL);