tests: drivers: counter_basic_api: Add support for the Raspberry Pi Pico 2

Only enable timer 0 for testing. Timer 1 won't work correctly until the
rpi_pico HAL has picked up the fix for `hardware_alarm_irq_handler`. See
raspberrypi/pico-sdk#1949 .

Signed-off-by: Andrew Featherstone <[email protected]>

Author: ajf58

tests/drivers/counter/counter_basic_api/boards/rpi_pico2.overlay

@@ -0,0 +1,9 @@
+/*
+ * Copyright (c) 2024 Andrew Featherstone
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+&timer0 {
+	status = "okay";
+};