tests: drivers: counter: counter_basic_api: add NEORV32 GPTMR support

Add support for testing the NEORV32 General Purpose Timer (GPTMR).

Signed-off-by: Henrik Brix Andersen <henrik@brixandersen.dk>

Author: henrikbrixandersen

tests/drivers/counter/counter_basic_api/src/test_counter.c

@@ -132,6 +132,9 @@ static const struct device *const devices[] = {
 #ifdef CONFIG_COUNTER_ITE_IT8XXX2
 	DEVS_FOR_DT_COMPAT(ite_it8xxx2_counter)
 #endif
+#ifdef CONFIG_COUNTER_NEORV32_GPTMR
+	DEVS_FOR_DT_COMPAT(neorv32_gptmr)
+#endif
 };
 
 static const struct device *const period_devs[] = {