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[Why] fill_stream_properties_from_drm_display_mode() will not configure pixel encoding to YCBCR422 when the DRM color format supports YCBCR422 but not YCBCR420 or YCBCR4444. Instead it will fallback to RGB. [How] Add support for YCBCR422 in pixel encoding mapping. Suggested-by: Mauri Carvalho <mcarvalho3@lenovo.com> Reviewed-by: Wayne Lin <wayne.lin@amd.com> Signed-off-by: Mario Limonciello <Mario.Limonciello@amd.com> Signed-off-by: Ray Wu <ray.wu@amd.com> Tested-by: Daniel Wheeler <daniel.wheeler@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>