input: add mouse side buttons to virtio input

Signed-off-by: NMiika S <miika9764@gmail.com>
Message-Id: <20171222152531.1849-3-miika9764@gmail.com>
Signed-off-by: NGerd Hoffmann <kraxel@redhat.com>

hw/input/virtio-input-hid.c

@@ -147,6 +147,8 @@ static const unsigned int keymap_button[INPUT_BUTTON__MAX] = {
     [INPUT_BUTTON_MIDDLE]            = BTN_MIDDLE,
     [INPUT_BUTTON_WHEEL_UP]          = BTN_GEAR_UP,
     [INPUT_BUTTON_WHEEL_DOWN]        = BTN_GEAR_DOWN,
+    [INPUT_BUTTON_SIDE]              = BTN_SIDE,
+    [INPUT_BUTTON_EXTRA]             = BTN_EXTRA,
 };
 
 static const unsigned int axismap_rel[INPUT_AXIS__MAX] = {