omx: add asString for new enumerations and fix some issues
am: 1b9c8069f4

* commit '1b9c8069f423f25c4dc166618d9fbe8d94d7f7c0':
  omx: add asString for new enumerations and fix some issues

Change-Id: I774af98ced6dd8bf7aac8873e3d93655fd5c6f2a