add overlay for bl54l15_radio0

bl54l15_radio0.overlay

@@ -0,0 +1,44 @@
+&uart20 {
+    compatible = "nordic,nrf-uarte";
+    status = "okay";
+    current-speed = <1000000>;
+    hw-flow-control;
+};
+
+
+&pinctrl {
+	uart20_default: uart20_default {
+		group1 {
+			psels = <NRF_PSEL(UART_TX, 1, 7)>,
+				<NRF_PSEL(UART_RTS, 1, 4)>;
+		};
+		group2 {
+			psels = <NRF_PSEL(UART_RX, 1, 6)>,
+				<NRF_PSEL(UART_CTS, 1, 5)>;
+			bias-pull-up;
+		};
+	};
+
+	uart20_sleep: uart20_sleep {
+		group1 {
+			psels = <NRF_PSEL(UART_TX, 1, 7)>,
+				<NRF_PSEL(UART_RX, 1, 6)>,
+				<NRF_PSEL(UART_RTS, 1, 4)>,
+				<NRF_PSEL(UART_CTS, 1, 5)>;
+			low-power-enable;
+		};
+	};
+};
+
+/ {
+	chosen {
+        zephyr,console = &uart20;
+		zephyr,shell-uart = &uart20;
+		//zephyr,uart-mcumgr = &uart0;
+		//zephyr,bt-mon-uart = &uart0;
+		//zephyr,bt-c2h-uart = &uart0;
+	};
+};
+&power {
+    status = "okay";
+};