frontends/va: Derive image from interlaced buffers for h264encode
Add h264encode application to allowlist to make an exception when deriving images from interlaced buffers
This test is part of libva-utils, find test code @ https://github.com/intel/libva-utils/blob/master/encode/h264encode.c
Signed-off-by: SureshGuttula suresh.guttula@amd.corp-partner.google.com