arm: dts: add cooling properties on omap4430 cpu node

OMAP4430 devices can reach high temperatures and thus
needs to have cpufreq-cooling on systems running on it.

This patch adds the required cooling device properties
so that cpufreq-cpu0 driver loads the cooling device.

Cc: "Benoît Cousson" <bcousson@baylibre.com>
Cc: Tony Lindgren <tony@atomide.com>
Cc: Russell King <linux@arm.linux.org.uk>
Cc: linux-omap@vger.kernel.org
Cc: devicetree-discuss@lists.ozlabs.org
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Eduardo Valentin <eduardo.valentin@ti.com>

arch/arm/boot/dts/omap443x.dtsi

@@ -22,6 +22,11 @@ cpu0: cpu@0 {
 				1008000 1375000
 			>;
 			clock-latency = <300000>; /* From legacy driver */
+
+			/* cooling options */
+			cooling-min-level = <0>;
+			cooling-max-level = <3>;
+			#cooling-cells = <2>; /* min followed by max */
 		};
 	};