ARM: dts: pxa3xx: Fix up encoding of the /gpio interrupts property

This way the device tree validator learns that each cell of the property
constitutes a separate item. Otherwise it gets unnecessairly upset:

pxa300-raumfeld-speaker-s.dt.yaml: gpio@40e00000: interrupts:
[[8, 9, 10]] is too short

Signed-off-by: Lubomir Rintel <[e-mail]>
Reviewed-by: Andrew Lunn <[e-mail]>
Reviewed-by: Robert Jarzmik <[e-mail].>
Signed-off-by: Arnd Bergmann <[e-mail]>

arch/arm/boot/dts/pxa3xx.dtsi

···
 			clocks = <&clks CLK_GPIO>;
 			gpio-ranges = <&pinctrl 0 0 128>;
 			interrupt-names = "gpio0", "gpio1", "gpio_mux";
-			interrupts = <8 9 10>;
+			interrupts = <8>, <9>, <10>;
 			gpio-controller;
 			#gpio-cells = <0x2>;
 			interrupt-controller;