arm64: tegra: Add blank lines for better readability

Separate the individual thermal zones by a blank line for improved
readability.
Signed-off-by: Thierry Reding <treding@nvidia.com>

arch/arm64/boot/dts/nvidia/tegra210.dtsi

@@ -1507,6 +1507,7 @@ map0 {
 				};
 			};
 		};
+
 		mem {
 			polling-delay-passive = <0>;
 			polling-delay = <0>;
@@ -1529,6 +1530,7 @@ cooling-maps {
 				 */
 			};
 		};
+
 		gpu {
 			polling-delay-passive = <1000>;
 			polling-delay = <0>;
@@ -1557,6 +1559,7 @@ map0 {
 				};
 			};
 		};
+
 		pllx {
 			polling-delay-passive = <0>;
 			polling-delay = <0>;