add overlay for bl654pa

bl654pa_gpio_uart.overlay

@@ -0,0 +1,45 @@
+&uart0 {
+    compatible = "nordic,nrf-uarte";
+    status = "okay";
+    current-speed = <115200>; //<1000000>;
+    //hw-flow-control;
+};
+
+
+&pinctrl {
+	uart0_default: uart0_default {
+		group1 {
+			psels = <NRF_PSEL(UART_TX, 0, 6)>, // SIO6
+				<NRF_PSEL(UART_RTS, 0, 5)>; //SIO5
+		};
+		group2 {
+			psels = <NRF_PSEL(UART_RX, 0, 8)>, //SIO8
+				<NRF_PSEL(UART_CTS, 0, 7)>; //SIO7
+			bias-pull-up;
+		};
+	};
+
+	uart0_sleep: uart0_sleep {
+
+		group1 {
+			psels = <NRF_PSEL(UART_TX, 0, 6)>,
+				<NRF_PSEL(UART_RX, 0, 8)>,
+				<NRF_PSEL(UART_RTS, 0, 5)>,
+				<NRF_PSEL(UART_CTS, 0, 7)>;
+			low-power-enable;
+		};
+	};
+};
+
+/ {
+	chosen {
+        zephyr,console = &uart0;
+		zephyr,shell-uart = &uart0;
+		//zephyr,uart-mcumgr = &uart0;
+		//zephyr,bt-mon-uart = &uart0;
+		//zephyr,bt-c2h-uart = &uart0;
+	};
+};
+&power {
+    status = "okay";
+};

internal_osc.conf

@@ -0,0 +1,4 @@
+# use internal 32kHz oscillator
+CONFIG_CLOCK_CONTROL_NRF_K32SRC_RC=y
+# select desired accuracy (more calibrations would be nececcary if smaller) - I think the 32KHz oscillator is only needed for receive
+CONFIG_CLOCK_CONTROL_NRF_K32SRC_250PPM=y