vga_switcheroo: add reprobe hook for fbcon to recheck connected outputs.

This adds a hook after the mux is switched for the driver to reprobe
the connected outputs.

Signed-off-by: Dave Airlie <airlied@redhat.com>
diff --git a/include/linux/vga_switcheroo.h b/include/linux/vga_switcheroo.h
index ae9ab13..f80fa9d 100644
--- a/include/linux/vga_switcheroo.h
+++ b/include/linux/vga_switcheroo.h
@@ -33,6 +33,7 @@
 void vga_switcheroo_unregister_client(struct pci_dev *dev);
 int vga_switcheroo_register_client(struct pci_dev *dev,
 				   void (*set_gpu_state)(struct pci_dev *dev, enum vga_switcheroo_state),
+				   void (*reprobe)(struct pci_dev *dev),
 				   bool (*can_switch)(struct pci_dev *dev));
 
 void vga_switcheroo_client_fb_set(struct pci_dev *dev,