drm: qxl: Open code teardown function for qxl

This avoids using the deprecated drm_put_dev() and unload() hook
interfaces in the qxl driver.

Signed-off-by: Gabriel Krisman Bertazi <krisman@collabora.co.uk>
Cc: Dave Airlie <airlied@redhat.com>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: Gustavo Padovan <gustavo.padovan@collabora.com>
Signed-off-by: Gustavo Padovan <gustavo.padovan@collabora.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170119134806.8926-2-krisman@collabora.co.uk

drivers/gpu/drm/qxl/qxl_drv.h

@@ -340,8 +340,6 @@ int qxl_device_init(struct qxl_device *qdev, struct drm_device *ddev,
 		    struct pci_dev *pdev,  unsigned long flags);
 void qxl_device_fini(struct qxl_device *qdev);
 
-void qxl_driver_unload(struct drm_device *dev);
-
 int qxl_modeset_init(struct qxl_device *qdev);
 void qxl_modeset_fini(struct qxl_device *qdev);