support output encoded key

[disksing]

mok -format hex "t\\x80\\x00\\x00\\x00\\x00\\x00W\\x00_r\\x80\\x00\\x00\\x00\\x00E\\xe9S"
"745C7838305C7830305C7830305C7830305C7830305C783030575C7830305F725C7838305C7830305C7830305C7830305C783030455C78653953"
└─## decode go literal key
  └─"7480000000000057005F72800000000045E953"
    └─## table row key
      ├─table: 22272
      └─row: 4581715

Sometime we need encoded('7480000000000057005F72800000000045E953')