drm/amd/display: Expose more formats for overlay planes on DCN

DCN planes are universal and therefore overlay planes can use the same
formats as primary planes, unlike DCE.

Gamescope/Steam Deck would like to take advantage of this functionality
for partial composition which in some cases in our pipeline, can contain
negative values in some instances.

Cc: Harry Wentland <[email protected]>
Cc: Melissa Wen <[email protected]>
Cc: Simon Ser <[email protected]>
Reviewed-by: Harry Wentland <[email protected]>
Signed-off-by: Joshua Ashton <[email protected]>
Signed-off-by: Hamza Mahfooz <[email protected]>
Signed-off-by: Alex Deucher <[email protected]>

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