ARM: dts: sun7i: Add uart4 support for BananaPro, disable uart2

The BananaPro uses uart4 for the default rx/tx pins on the 40 pins connector,
so enable uart4.

Uart2 is also available at the bananapro io-pins, but like on the bananapi
the primary function of the pins is to act as gpios, see:
http://forum.lemaker.org/forum.php?mod=viewthread&tid=10852

Remove the uart2 node, people who want to use uart2 can do so with a
devicetree-overlay.
Signed-off-by: Michael Ring <mail@michael-ring.org>
[hdegoede@redhat.com: Remove uart2 node]
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>

arch/arm/boot/dts/sun7i-a20-bananapro.dts

@@ -52,7 +52,7 @@ / {
 
 	aliases {
 		serial0 = &uart0;
-		serial1 = &uart2;
+		serial1 = &uart4;
 		serial2 = &uart7;
 	};
 
@@ -250,9 +250,9 @@ &uart0 {
 	status = "okay";
 };
 
-&uart2 {
+&uart4 {
 	pinctrl-names = "default";
-	pinctrl-0 = <&uart2_pins_a>;
+	pinctrl-0 = <&uart4_pins_b>;
 	status = "okay";
 };