Convert CONFIG_CONSOLE_EXTRA_INFO to Kconfig

This converts the following to Kconfig:
   CONFIG_CONSOLE_EXTRA_INFO

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Tom Rini <trini@konsulko.com>
diff --git a/drivers/video/Kconfig b/drivers/video/Kconfig
index 6492366..fa9f9fa 100644
--- a/drivers/video/Kconfig
+++ b/drivers/video/Kconfig
@@ -513,6 +513,16 @@
 	  position when entering text on the console. It is recommended to
 	  enable this.
 
+config CONSOLE_EXTRA_INFO
+	bool "Display additional board information"
+	depends on CFB_CONSOLE
+	help
+	  Display additional board information strings that normally go to
+	  the serial port. When this option is enabled, a board-specific
+	  function video_get_info_str() is called to get the string for
+	  each line of the display. The function should return the string,
+	  which can be empty if there is nothing to display for that line.
+
 config VIDEO_CT69000
 	bool "Enable Chips & Technologies 69000 video driver"
 	depends on VIDEO