sunxi: display: Add composite video out support

Add composite video out support.

This only gets enabled on the Mele M3 for now, since that is were it
was tested. It will be enabled on more boards after testing.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Acked-by: Ian Campbell <ijc@hellion.org.uk>
diff --git a/board/sunxi/Kconfig b/board/sunxi/Kconfig
index c4b5a85..13f4537 100644
--- a/board/sunxi/Kconfig
+++ b/board/sunxi/Kconfig
@@ -410,6 +410,13 @@
 	Set the enable pin for the external VGA DAC. This takes a string in the
 	format understood by sunxi_name_to_gpio, e.g. PH1 for pin 1 of port H.
 
+config VIDEO_COMPOSITE
+	boolean "Composite video output support"
+	depends on VIDEO && (MACH_SUN4I || MACH_SUN5I || MACH_SUN7I)
+	default n
+	---help---
+	Say Y here to add support for outputting composite video.
+
 config VIDEO_LCD_MODE
 	string "LCD panel timing details"
 	depends on VIDEO