drm/amd/display: Fill plane attrs only for valid pxl format
[Why] In fill_plane_buffer_attributes() we calculate chroma/luma assuming that the surface_pixel_format is always valid. If it's not the case, there's a risk of divide by zero error. [How] Check if format valid before calculating pixel format attributes Signed-off-by: NRoman Li <Roman.Li@amd.com> Reviewed-by: NDavid Francis <David.Francis@amd.com> Acked-by: NBhawanpreet Lakha <Bhawanpreet.Lakha@amd.com> Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>
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