drm/vc4: hdmi: Add a function to retrieve the CSC matrix

The CSC matrix to use depends on the output format, its range and the
colorspace.

Since we're going to add more colorspaces, let's move the CSC matrix
retrieval to a function.

Signed-off-by: Dave Stevenson <[email protected]>
Reviewed-by: Thomas Zimmermann <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Maxime Ripard <[email protected]>

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