omx: prevent input port enable/disable for software codecs am: 2b94fa8277 am: c83b53c9e5 am: f054728108 am: 062fd4a341 am: 45fb504379 am: 56fb1ed051
am: e02be17174

Change-Id: I7f452f8033eb9aa1aea4401e803493c5951b0581