rockchip/dptx: update WHENCE to version 3.1

52ef7302

 didn't bump it here.
Signed-off-by: Kyle McMartin <kyle@kernel.org>

WHENCE

@@ -3344,6 +3344,6 @@ OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
 Driver: rk3399-dptx - ROCKCHIP rk3399 dptx firmware
 
 File: rockchip/dptx.bin
-Version: 2.9
+Version: 3.1
 
 Licence: Redistributable. See LICENCE.rockchip for details.