drm/amd/display: Use full update for swizzle mode change

[WHY & HOW]
1) We did linear/non linear transition properly long ago
2) We used that path to handle SystemDisplayEnable
3) We fixed a SystemDisplayEnable inability to fallback to passive by
   impacting the transition flow generically
4) AFMF later relied on the generic transition behavior

Separating the two flows to make (3) non-generic is the best immediate
coarse of action.

DC can discern SSAMPO3 very easily from SDE.

Cc: Mario Limonciello <[email protected]>
Cc: Alex Deucher <[email protected]>
Cc: [email protected]
Reviewed-by: Chris Park <[email protected]>
Signed-off-by: Charlene Liu <[email protected]>
Signed-off-by: Alex Hung <[email protected]>
Tested-by: Daniel Wheeler <[email protected]>
Signed-off-by: Alex Deucher <[email protected]>

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