drm/tegra: Convert drm_atomic_helper_suspend/resume()

convert drm_atomic_helper_suspend/resume() to use
drm_mode_config_helper_suspend/resume().

With this conversion, tegra_drm_fb_suspend() and
tegra_drm_fb_resume() will not be used anymore.
Both of these functions can be removed.

Also, in tegra_drm struct's member state will not be
used anymore. So this can be removed forever.

Fixed one sparse warning.

Signed-off-by: Souptick Joarder <jrdr.linux@gmail.com>
Signed-off-by: Ajit Negi <ajitn.linux@gmail.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
diff --git a/drivers/gpu/drm/tegra/fb.c b/drivers/gpu/drm/tegra/fb.c
index 4c22cdd..b947e82 100644
--- a/drivers/gpu/drm/tegra/fb.c
+++ b/drivers/gpu/drm/tegra/fb.c
@@ -356,7 +356,7 @@ static void tegra_fbdev_exit(struct tegra_fbdev *fbdev)
 		/* Undo the special mapping we made in fbdev probe. */
 		if (bo && bo->pages) {
 			vunmap(bo->vaddr);
-			bo->vaddr = 0;
+			bo->vaddr = NULL;
 		}
 
 		drm_framebuffer_remove(fbdev->fb);
@@ -412,25 +412,3 @@ void tegra_drm_fb_exit(struct drm_device *drm)
 	tegra_fbdev_exit(tegra->fbdev);
 #endif
 }
-
-void tegra_drm_fb_suspend(struct drm_device *drm)
-{
-#ifdef CONFIG_DRM_FBDEV_EMULATION
-	struct tegra_drm *tegra = drm->dev_private;
-
-	console_lock();
-	drm_fb_helper_set_suspend(&tegra->fbdev->base, 1);
-	console_unlock();
-#endif
-}
-
-void tegra_drm_fb_resume(struct drm_device *drm)
-{
-#ifdef CONFIG_DRM_FBDEV_EMULATION
-	struct tegra_drm *tegra = drm->dev_private;
-
-	console_lock();
-	drm_fb_helper_set_suspend(&tegra->fbdev->base, 0);
-	console_unlock();
-#endif
-}