drm/amd/display: Add pwait status to DMCUB debug logging

drm/amd/display: Add pwait status to DMCUB debug logging

[Why]
To know if DMCUB is idle at the time of the debug data being collected.

[How]
Extend the logging to include the field.

It's already captured as part of each ASIC's get_diagnostic_data.

Reviewed-by: Dillon Varone <dillon.varone@amd.com>
Signed-off-by: Nicholas Kazlauskas <nicholas.kazlauskas@amd.com>
Signed-off-by: Matthew Stewart <matthew.stewart2@amd.com>
Tested-by: Dan Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>