dt-bindings: arm: sunxi: Add compatible for Tanix TX6 board

Add new Oranth Tanix TX6 board compatible string to the bindings
documentation.

Signed-off-by: Jernej Skrabec <jernej.skrabec@siol.net>
Signed-off-by: Maxime Ripard <maxime.ripard@bootlin.com>
1 file changed