drm/amdgpu: Add MODE register to wave debug info in gfx11

All other chips, from gfx6-gfx10, now include the MODE register at the
end of the wave debug state. This appears to have been missed in gfx11,
so this patch adds in MODE to the debug state for gfx11.

Signed-off-by: Joseph Greathouse <Joseph.Greathouse@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>