dm: video: Add support for video bridges

A video bridge typically converts video from one format to another, e.g.
DisplayPort to LVDS. Add driver model support for these with a simple
interface to control activation and backlight. The uclass supports GPIO
control of power and reset lines.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/drivers/video/bridge/Makefile b/drivers/video/bridge/Makefile
new file mode 100644
index 0000000..f4bf087
--- /dev/null
+++ b/drivers/video/bridge/Makefile
@@ -0,0 +1,7 @@
+#
+#  Copyright (C) 2015 Google, Inc
+#  Written by Simon Glass <sjg@chromium.org>
+#
+#  SPDX-License-Identifier:	GPL-2.0+
+
+obj-$(CONFIG_VIDEO_BRIDGE) += video-bridge-uclass.o