drm/amd/display: Update extended timeout support for DCN20 and DCN21

[Why]
DCN21 and DCN2 extended timeout support cap is not set correctly.

[How]
Set extended timeout support for ASIC families to their right values.

Signed-off-by: abdoulaye berthe <abdoulaye.berthe@amd.com>
Reviewed-by: Martin Leung <Martin.Leung@amd.com>
Acked-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>