drm/amd/display: programming last delta in output transfer function LUT to a correct value

[Why]
Currently DAL programs negative slope for the last point of output
transfer function curve.

[How]
Applying a check for the last PWL point for RGB values not to be
smaller than previous. If smaller, initialize the last point values
to a sum of previous PWL value and previous PWL delta;

Signed-off-by: Vladimir Stempen <[email protected]>
Reviewed-by: Tony Cheng <[email protected]>
Acked-by: Jun Lei <[email protected]>
Acked-by: Rodrigo Siqueira <[email protected]>
Acked-by: Harry Wentland <[email protected]>
Signed-off-by: Alex Deucher <[email protected]>

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