dm: video: Add driver for coreboot framebuffer device

This adds a DM driver for coreboot framebuffer device.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/drivers/video/Kconfig b/drivers/video/Kconfig
index fd26690..86db0da 100644
--- a/drivers/video/Kconfig
+++ b/drivers/video/Kconfig
@@ -101,6 +101,15 @@
 	  to update the environment, the breakage may be confusing for users.
 	  This option will be removed around the end of 2016.
 
+config VIDEO_COREBOOT
+	bool "Enable coreboot framebuffer driver support"
+	depends on X86 && SYS_COREBOOT
+	help
+	  Turn on this option to enable a framebuffer driver when U-Boot is
+	  loaded by coreboot where the graphics device is configured by
+	  coreboot already. This can in principle be used with any platform
+	  that coreboot supports.
+
 config VIDEO_VESA
 	bool "Enable VESA video driver support"
 	default n