Revert "drm/amd/display: Signal hw_done() after waiting for flip_done()"

This reverts commit 717276b9.

The reverted patch was a workaround that addressed an issue fixed by:
4364bcb2 ("drm: Get ref on CRTC commit object when waiting for
flip_done")
Signed-off-by: Leo Li <sunpeng.li@amd.com>
Reviewed-by: Nicholas Kazlauskas <Nicholas.Kazlauskas@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c

@@ -5257,18 +5257,12 @@ static void amdgpu_dm_atomic_commit_tail(struct drm_atomic_state *state)
 	}
 	spin_unlock_irqrestore(&adev->ddev->event_lock, flags);
 
+	/* Signal HW programming completion */
+	drm_atomic_helper_commit_hw_done(state);
 
 	if (wait_for_vblank)
 		drm_atomic_helper_wait_for_flip_done(dev, state);
 
-	/*
-	 * FIXME:
-	 * Delay hw_done() until flip_done() is signaled. This is to block
-	 * another commit from freeing the CRTC state while we're still
-	 * waiting on flip_done.
-	 */
-	drm_atomic_helper_commit_hw_done(state);
-
 	drm_atomic_helper_cleanup_planes(dev, state);
 
 	/*