tests: boards: nrf: qdec: Disable testing of 2nd instance until fixed

Disable testing second QDEC instance until the issue with multiple
QDEC instances support is resolved

Signed-off-by: Bartosz Miller <bartosz.miller@nordicsemi.no>

Author: nordic-bami

tests/boards/nrf/qdec/src/main.c

@@ -17,7 +17,11 @@ static const struct gpio_dt_spec phase_b = GPIO_DT_SPEC_GET(DT_ALIAS(qencb), gpi
 static const struct device *const qdec_dev = DEVICE_DT_GET(DT_ALIAS(qdec0));
 static const uint32_t qdec_config_step = DT_PROP(DT_ALIAS(qdec0), steps);
 
-#if DT_NODE_EXISTS(DT_ALIAS(qdec1))
+/* Disable testing second QDEC instance
+ * until the issue with multiple
+ * QDEC instances support is resolved
+ */
+#if DT_NODE_EXISTS(DT_ALIAS(qdecX))
 #define SECOND_QDEC_INSTANCE
 
 static const struct gpio_dt_spec phase_a1 = GPIO_DT_SPEC_GET(DT_ALIAS(qenca1), gpios);