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: I26e6e98d64843f15cb551011b502da0b0559c30a