ARM: dts: exynos: Add CPU cooling in SMDK4412

Add missing cooling devices for CPU thermal zones in Exynos4412 SMDK4412
board.  This allows to scale down CPU frequency (and voltage) in case of
thermal pressure.
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
Link: https://lore.kernel.org/r/20200830135200.24304-29-krzk@kernel.org

arch/arm/boot/dts/exynos4412-smdk4412.dts

@@ -40,6 +40,21 @@ xusbxti {
 	};
 };
 
+&cpu_thermal {
+	cooling-maps {
+		cooling_map0: map0 {
+			/* Corresponds to 800MHz at freq_table */
+			cooling-device = <&cpu0 7 7>, <&cpu1 7 7>,
+					 <&cpu2 7 7>, <&cpu3 7 7>;
+		};
+		cooling_map1: map1 {
+			/* Corresponds to 200MHz at freq_table */
+			cooling-device = <&cpu0 13 13>, <&cpu1 13 13>,
+					 <&cpu2 13 13>, <&cpu3 13 13>;
+		};
+	};
+};
+
 &keypad {
 	samsung,keypad-num-rows = <3>;
 	samsung,keypad-num-columns = <8>;