ARM: dts: omap: Remove "cooling-{min|max}-level" for CPU nodes

The "cooling-min-level" and "cooling-max-level" properties are not
parsed by any part of the kernel currently and the max cooling state of
a CPU cooling device is found by referring to the cpufreq table instead.

Remove the unused properties from the CPU nodes.

Signed-off-by: Viresh Kumar <[e-mail]>
Signed-off-by: Tony Lindgren <[e-mail]>

arch/arm/boot/dts/dra7.dtsi

···
 			clock-latency = <300000>; /* From omap-cpufreq driver */
 
 			/* cooling options */
-			cooling-min-level = <0>;
-			cooling-max-level = <2>;
 			#cooling-cells = <2>; /* min followed by max */
 
 			vbb-supply = <&abb_mpu>;

arch/arm/boot/dts/omap443x.dtsi

···
 			clock-latency = <300000>; /* From legacy driver */
 
 			/* cooling options */
-			cooling-min-level = <0>;
-			cooling-max-level = <3>;
 			#cooling-cells = <2>; /* min followed by max */
 		};
 	};

arch/arm/boot/dts/omap4460.dtsi

···
 			clock-latency = <300000>; /* From legacy driver */
 
 			/* cooling options */
-			cooling-min-level = <0>;
-			cooling-max-level = <2>;
 			#cooling-cells = <2>; /* min followed by max */
 		};
 	};

arch/arm/boot/dts/omap5.dtsi

···
 			clock-latency = <300000>; /* From omap-cpufreq driver */
 
 			/* cooling options */
-			cooling-min-level = <0>;
-			cooling-max-level = <2>;
 			#cooling-cells = <2>; /* min followed by max */
 		};
 		cpu@1 {