drm/amd/display: apply two different methods to validate modes

[Why]
In DML2, the current method to determine a
mode is supported involves checking the
voltage levels sequentially from the lowest,
until one is found that can support the
mode. It causes cursor lag due to low
performance.

[How]
We apply two methods for mode validation.
1) DC_VALIDATE_MODE_ONLY: only the
maximum voltage level is checked to
determine whether the mode is supported, which
improves performance and eliminate cursor lag.

2) DC_VALIDATE_MODE_AND_STATE_INDEX: when
the optimal voltage level is required, check
the voltage level from the lowest until
a suitable one is found found and returns
its index.

Reviewed-by: Nicholas Kazlauskas <[email protected]>
Reviewed-by: Aric Cyr <[email protected]>
Signed-off-by: Yan Li <[email protected]>
Signed-off-by: Aurabindo Pillai <[email protected]>
Signed-off-by: Alex Deucher <[email protected]>

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