evas-drm: Handle render mode for 4 buffers

Summary: If we are using 4 buffers, we should be returning
MODE_QUADRUPLE for render_mode_get function

@fix

Signed-off-by: Chris Michael <cp.michael@samsung.com>

src/modules/evas/engines/drm/evas_outbuf.c

@@ -185,6 +185,8 @@ evas_outbuf_buffer_state_get(Outbuf *ob)
         return MODE_DOUBLE;
       case 2:
         return MODE_TRIPLE;
+      case 3:
+        return MODE_QUADRUPLE;
       default:
         return MODE_FULL;
      }