drm/amd/display: LTTPR config logic
[WHY] Some systems can enable LTTPR through bits in BIOS, while other systems can be configured at boot to enable LTTPR. Some configs enable Non-Transparent mode, while others enable Transparent mode. Signed-off-by: NWesley Chalmers <Wesley.Chalmers@amd.com> Reviewed-by: NJun Lei <Jun.Lei@amd.com> Acked-by: NAnson Jacob <Anson.Jacob@amd.com> Tested-by: NDan Wheeler <daniel.wheeler@amd.com> Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>
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