drm/amdgpu: skip psp suspend for IMU enabled ASICs mode2 reset

The psp suspend & resume should be skipped to avoid destroy
the TMR and reload FWs again for IMU enabled APU ASICs.

Signed-off-by: Tim Huang <tim.huang@amd.com>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Reviewed-by: Mario Limonciello <mario.limonciello@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>