ARM: dts: uniphier: add Denali NAND controller node

Add NAND controller node to LD4, Pro4, sLD8, Pro5, and PXs2.
Set up pinctrl to enable 2 chip select lines except Pro4.  The CS1
for Pro4 is multiplexed with other peripherals such as UART2, so
I did not enable it.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>

arch/arm/boot/dts/uniphier-ld6b-ref.dts

@@ -58,3 +58,7 @@
 &i2c0 {
 	status = "okay";
 };
+
+&nand {
+	status = "okay";
+};