ARM: dts: Add #pinctrl-cells for pinctrl-single instances

Drivers using pinctrl-single,pins have #pinctrl-cells = <1>, while
pinctrl-single,bits need #pinctrl-cells = <2>.

Note that this patch can be optionally applied separately from the
driver changes as the driver supports also the legacy binding without
#pinctrl-cells.

Acked-by: Rob Herring <robh@kernel.org>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Tony Lindgren <tony@atomide.com>
diff --git a/arch/arm/boot/dts/pxa3xx.dtsi b/arch/arm/boot/dts/pxa3xx.dtsi
index 9d6f3aa..7a0cc4e 100644
--- a/arch/arm/boot/dts/pxa3xx.dtsi
+++ b/arch/arm/boot/dts/pxa3xx.dtsi
@@ -138,6 +138,7 @@
 			reg = <0x40e10000 0xffff>;
 			#address-cells = <1>;
 			#size-cells = <0>;
+			#pinctrl-cells = <1>;
 			pinctrl-single,register-width = <32>;
 			pinctrl-single,function-mask = <0x7>;
 		};