tests/kms_flip_scaled_crc: Validate NN scaling filter

SCALING_FILTER can be used either as plane scaler property
or CRTC scaler property.
The value of this property can be one of the following:
    Default:
             Driver's default scaling filter
    Nearest Neighbor:
             Nearest Neighbor scaling filter
If NN is used for scaling, sharpness is preserved
whereas if we use default scaling we can see blurriness
at edges.

v2: -no need to set pipe scaler filter property
v3: -addition of new lines to improve readability
    -use of SPDX licence placeholder
    -close(data.drm_fd)
v4: -instead of creating new i-g-t, tweaked kms_flip_scaled_crc
     to validate both default and nn scaling filters
v5: -removed duplicate block
    -added platform check for nn
v6:(juha): -Don't skip on missing property, assert on where
     expect to find it.
    - Allow test to run correctly on all gen9 upwards platforms.
    - run default and NN filters on same test.

Signed-off-by: Swati Sharma <swati2.sharma@intel.com>
Signed-off-by: Juha-Pekka Heikkila <juhapekka.heikkila@gmail.com>
Reviewed-by: Mika Kahola <mika.kahola@intel.com>

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