openmax: add OMX_IndexConfigPriority.

Bug: 19620911
Change-Id: I776c1537e5fd88052609cab66d60905f7e30400a
diff --git a/include/media/openmax/OMX_AsString.h b/include/media/openmax/OMX_AsString.h
index 0f177a1..dbcecf5 100644
--- a/include/media/openmax/OMX_AsString.h
+++ b/include/media/openmax/OMX_AsString.h
@@ -521,6 +521,7 @@
         case OMX_IndexParamVideoHevc:                   return "ParamVideoHevc";
 //      case OMX_IndexParamSliceSegments:               return "ParamSliceSegments";
         case OMX_IndexConfigAutoFramerateConversion:    return "ConfigAutoFramerateConversion";
+        case OMX_IndexConfigPriority:                   return "ConfigPriority";
         default:                                        return asString((OMX_INDEXTYPE)i, def);
     }
 }