drivers: adc: fix IF_ENABLED macro usage in ADS1X1X trigger

The ADC_ADS1X1X_TRIGGER macro was defined without an explicit value,
preventing ALERT/RDY pin configuration even when alert_rdy_gpios
were properly defined in devicetree. This occurred because
the IF_ENABLED macro specifically requires macros to be defined as 1,
not just defined empty.

Fixed this by explicitly defining ADC_ADS1X1X_TRIGGER as 1 when
alert_rdy_gpios properties are present in devicetree.

Signed-off-by: Benjamin Geiger <[email protected]>

drivers/adc/adc_ads1x1x.c

@@ -26,7 +26,7 @@ LOG_MODULE_REGISTER(ADS1X1X, CONFIG_ADC_LOG_LEVEL);
 	DT_ANY_COMPAT_HAS_PROP_STATUS_OKAY(ti_ads1015, alert_rdy_gpios) || \
 	DT_ANY_COMPAT_HAS_PROP_STATUS_OKAY(ti_ads1014, alert_rdy_gpios)
 
-#define ADC_ADS1X1X_TRIGGER
+#define ADC_ADS1X1X_TRIGGER 1
 
 #endif