Vts Omx Tests: Disable test that are not IOMX compatible

Android IOMX differs slightly from OMX. Disable tests that are not
needed (for now). We will revisit them at a later stage

Bug:32023356
Bug:37501531

Test: make vts.

Change-Id: Iad71d72a4a66d621f415731d2c0e1a3794ed3524