gitadora: (arena model) lights (#492)

## Link to GitHub Issue, if one exists
#477 

## Description of change
Add lights for J region cab. I can't figure out how the extra lights on
U region cab are wired up.

## Testing
Tested guitar and drums, J and U regions.

src/spice2x/games/gitadora/io.h

@@ -191,7 +191,18 @@ namespace games::gitadora {
             GuitarRightSpeakerMidLowRightB,
             GuitarRightSpeakerLowerR,
             GuitarRightSpeakerLowerG,
-            GuitarRightSpeakerLowerB
+            GuitarRightSpeakerLowerB,
+
+            // arena model (common for both guitar and drum)
+            ArenaTitleAvgR,
+            ArenaTitleAvgG,
+            ArenaTitleAvgB,
+            ArenaWooferR,
+            ArenaWooferG,
+            ArenaWooferB,
+            ArenaCardR,
+            ArenaCardG,
+            ArenaCardB,
         } gitadora_lights_t;
     }