Call libvintf to verify package compatibility.

The libvintf API has landed. Hook up to do the actual verification.

Bug: 36597505
Test: recovery_component_test
Test: m recoveryimage; adb sideload on angler and sailfish, with
      packages that contain dummy compatibility entries.
Test: m recoveryimage; adb sideload on angler and sailfish, with
      packages that don't contain any compatibility entries.
Change-Id: Idbd6f5aaef605ca51b20e667505d686de5ac781f