gen-image: Update the RGB to YCbCr conversion to match VSP hardware

RGB to YCbCr conversion is only used at the moment to generate images
for test cases that run fully YUV pipelines. The exact value of the RGB
to YCbCr conversion matrices hasn't mattered much so far. However, this
will change with introduction of tests that perform RGB to YCbCr
conversion. To achieve pixel-perfect match between the reference and
hardware frames, reference images need to be generated with the exact
method used by the VSP.

Replace the current coefficients by values obtained from
reverse-engineering of the RGB to YCbCr conversion performed by the
VSP1. Remove support for SMPTE240 and BT.2020, as the VSP hardware
supports BT.601 and BT.709 only.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

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