intelfb: add preliminary i2c support

Adds code to unregister the I2C buses in the cleanup function.

Signed-off-by: Dennis Munsie <dmunsie@cecropia.com>
diff --git a/drivers/video/intelfb/intelfbdrv.c b/drivers/video/intelfb/intelfbdrv.c
index f412b5a..f6e30b3 100644
--- a/drivers/video/intelfb/intelfbdrv.c
+++ b/drivers/video/intelfb/intelfbdrv.c
@@ -474,6 +474,11 @@
 		agp_free_memory(dinfo->gtt_ring_mem);
 	}
 
+#ifdef CONFIG_FB_INTEL_I2C
+	/* un-register I2C bus */
+	intelfb_delete_i2c_busses(dinfo);
+#endif
+
 	if (dinfo->mmio_base)
 		iounmap((void __iomem *)dinfo->mmio_base);
 	if (dinfo->aperture.virtual)