Revert "drm/shmobile: cleanup: drm_modeset_lock_all() --> DRM_MODESET_LOCK_ALL_BEGIN()"

This reverts commit 9b8c437ef1a5f34686fc96b391c201a80f1a2ea0.

This patchset breaks on intel platforms and was previously NACK'd by
Ville.

Cc: Ville Syrjälä <[e-mail]>
Cc: Fernando Ramos <[e-mail]>
Acked-by: Ville Syrjälä <[e-mail]>
Signed-off-by: Sean Paul <[e-mail]>
Link: https://patchwork.freedesktop.org/patch/msgid/[e-mail]

drivers/gpu/drm/shmobile/shmob_drm_drv.c

···
 static int shmob_drm_pm_resume(struct device *dev)
 {
 	struct shmob_drm_device *sdev = dev_get_drvdata(dev);
-	struct drm_modeset_acquire_ctx ctx;
-	int ret;
 
-	DRM_MODESET_LOCK_ALL_BEGIN(sdev->ddev, ctx, 0, ret);
+	drm_modeset_lock_all(sdev->ddev);
 	shmob_drm_crtc_resume(&sdev->crtc);
-	DRM_MODESET_LOCK_ALL_END(sdev->ddev, ctx, ret);
+	drm_modeset_unlock_all(sdev->ddev);
 
 	drm_kms_helper_poll_enable(sdev->ddev);
 	return 0;