tests/gem_render_copy: Add a subtest for AUX_CCS_E

Add a new subtest that does renders the test pattern into a
compressed buffer. And we'll follow it up with another copy
back to an uncompressed buffer so that we also test the
capability to sampled from compressed buffers, and also so
that we can actually compare the results against the reference
image.

We'll also do a quick check of the aux surface to check that
it actually indicates that at least some parts of the buffer
were in fact compressed. Further visual verification can be
done via the dumped png.

v2: Test various tiling formats with CCS as well
    Combine the ccs test into the same function as
    the rest
    Pass the correct thing to intel_gen()

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>

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