Fix parsing of meta box in IsoInterface

There are two different standards for the meta box, ISO and QT. The
previous implementation only parsed the ISO box correctly.

Peek into the box to figure out which variety it is, and then parse it
as a parent.

Bug: 137181478
Test: atest IsoInterfaceTest
Change-Id: I5b0dd56e740b5042b1e79b9a4d7b52b4c9b557d8
3 files changed