drm/amd/display: Set max supported display clock without max_clks_by_state (v2)

drm/amd/display: Set max supported display clock without max_clks_by_state (v2)

The max_clks_by_state was based on hardcoded values, which are
not really used anywhere, only to know the maximum clock.
Just hardcode the same maximum clock for each DCE version.

v2:
- Use previous max display clock for DCE 11.2

Acked-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Timur Kristóf <timur.kristof@gmail.com>
Reviewed-by: Melissa Wen <mwen@igalia.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>