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We want to be able to read the MPC's gamut remap matrix similar to
what we do with .dpp_get_gamut_remap functions. On the other hand, we
don't need a hook here because only DCN3+ has the MPC gamut remap
block, being absent in previous families.
Signed-off-by: Melissa Wen <mwen@igalia.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>