airoha: support for /dev/hwrng via the airoha-trng driver for EN7523

(cherry picked from commit 11bd8188)

airoha/dts/en7523-base.dtsi

@@ -389,8 +389,8 @@
 		interrupts = <GIC_SPI 44 IRQ_TYPE_LEVEL_HIGH>;
 	};
 
-	trng@1faa1000 {
-		compatible = "econet,ecnt-trng";
+	airoha_trng@1faa1000 {
+		compatible = "airoha,airoha-trng";
 		reg = <0x1faa1000 0xc04>;
 		interrupts = <GIC_SPI 35 IRQ_TYPE_LEVEL_HIGH>;
 	};

airoha/en7523/config-5.4

@@ -262,6 +262,8 @@ CONFIG_HOSTAP=y
 CONFIG_HOSTAP_FIRMWARE=y
 CONFIG_HOSTAP_FIRMWARE_NVRAM=y
 CONFIG_HOTPLUG_CPU=y
+CONFIG_HW_RANDOM=y
+CONFIG_HW_RANDOM_AIROHA=y
 CONFIG_HZ=100
 CONFIG_HZ_100=y
 CONFIG_HZ_FIXED=0