samples: basic: button: Disable led on bg27 boards

Button 0 and LED 0 share a GPIO pin on bg27 boards. Remove the
`led0` alias in a board overlay to make the button sample work
out of the box.

Signed-off-by: Aksel Skauge Mellbye <aksel.mellbye@silabs.com>

Author: asmellby

boards/silabs/radio_boards/xg27/doc/bg27_rb4110b.rst

@@ -46,6 +46,13 @@ Serial Port
 The EFR32BG27 SoC has two USARTs and one EUSART.
 USART1 is connected to the board controller and is used for the console.
 
+Buttons and LEDs
+================
+
+This board has two buttons and two LEDs that share GPIO pins. If an application wants to use both
+a button and a LED with the same number (e.g. button 0 and LED 0), it needs to time multiplex the
+two functions.
+
 Programming and Debugging
 *************************
 

boards/silabs/radio_boards/xg27/doc/bg27_rb4111b.rst

@@ -47,6 +47,13 @@ Serial Port
 The EFR32BG27 SoC has two USARTs and one EUSART.
 USART1 is connected to the board controller and is used for the console.
 
+Buttons and LEDs
+================
+
+This board has two buttons and two LEDs that share GPIO pins. If an application wants to use both
+a button and a LED with the same number (e.g. button 0 and LED 0), it needs to time multiplex the
+two functions.
+
 Programming and Debugging
 *************************
 

samples/basic/button/boards/bg27_rb4110b.overlay

@@ -0,0 +1,12 @@
+/*
+ * Copyright (c) 2025 Silicon Laboratories Inc.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/ {
+	aliases {
+		/* led0 interferes with sw0 since it uses the same pin */
+		/delete-property/ led0;
+	};
+};

samples/basic/button/boards/bg27_rb4111b.overlay

@@ -0,0 +1,12 @@
+/*
+ * Copyright (c) 2025 Silicon Laboratories Inc.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/ {
+	aliases {
+		/* led0 interferes with sw0 since it uses the same pin */
+		/delete-property/ led0;
+	};
+};