After moving all functions needed for gpgpu and media fill testing
there is a lot of duplications which can be removed:
  Library media_fill_gen8 and media_fill_gen8lp for CHT was removed,
media state flush for !CHT was added to gen7_emit_media_objects.
  Many gen8 functions were replaced with gen7 version with devid
parameter (gen7_fill_curbe_load, gen7_emit_interface_descriptor,
gen7_fill_binding_table, gen7_emit_media_objects). Unified fill kernel
function so it is applicable to all gens and both media and gpgpu
(merged gen7_fill_media_kernel and gen8_fill_media_kernel).
  Duplicated constants like GEN8_MEDIA_VFE_STATE, GEN8_MEDIA_CURBE_LOAD,
GEN8_MEDIA_INTERFACE_DESCRIPTOR_LOAD, GEN8_MEDIA_OBJECT were
replaced by GEN7 version. However this constants were not removed
from gen8_media.h library, because they are used by other tests
for Gen8+. More refactoring in this gen*_media.h libraries is needed.

It seems that further unification of *_fillfunc functions will
introduce more confusion in understanding what the tests are doing
and what were changes between Gens.

v2: Moved some reduntant changes from Move gpgpu/media fill to gpu_fill...
to this patch. Applied comments from review.

v3: rebase

Signed-off-by: Katarzyna Dec <katarzyna.dec@intel.com>
Cc: Lukasz Kalamarz <lukasz.kalamarz@intel.com>
Cc: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Reviewed-by: Radoslaw Szwichtenberg <radoslaw.szwichtenberg@intel.com>