boards: st: stm32h573i_dk: Fix RNG configuration for TF-M builds

Only enable STM32 RNG peripheral when building for non-TF-M targets and
disable it for TF-M builds to avoid conflicts with the secure side.

For TF-M builds, enable the PSA Crypto RNG driver instead.

Signed-off-by: Tim Pambor <tim.pambor@codewrights.de>

Author: tpambor

boards/st/stm32h573i_dk/stm32h573i_dk-common.dtsi

@@ -261,10 +261,6 @@
 	status = "okay";
 };
 
-&rng {
-	status = "okay";
-};
-
 &mac {
 	status = "okay";
 	pinctrl-0 = <&eth_rxd0_pc4

boards/st/stm32h573i_dk/stm32h573i_dk.dts

@@ -60,3 +60,7 @@
 		};
 	};
 };
+
+&rng {
+	status = "okay";
+};

boards/st/stm32h573i_dk/stm32h573i_dk_stm32h573xx_ext_flash_app.dts

@@ -54,3 +54,7 @@
 		};
 	};
 };
+
+&rng {
+	status = "okay";
+};

boards/st/stm32h573i_dk/stm32h573i_dk_stm32h573xx_ns.dts

@@ -16,6 +16,12 @@
 		zephyr,flash = &flash0;
 		zephyr,flash-controller = &flash;
 		zephyr,code-partition = &slot0_ns_partition;
+		zephyr,entropy = &psa_rng;
+	};
+
+	psa_rng: psa-rng {
+		compatible = "zephyr,psa-crypto-rng";
+		status = "okay";
 	};
 };