sensor: add SENSOR_CHAN_O2 enum value

Add an enum value to support O2 sensors.

Signed-off-by: Jeppe Odgaard <jeppe.odgaard@prevas.dk>

drivers/sensor/sensor_shell.c

@@ -74,6 +74,7 @@ static const char *sensor_channel_name[SENSOR_CHAN_COMMON_COUNT] = {
 	[SENSOR_CHAN_PM_10] = "pm_10",
 	[SENSOR_CHAN_DISTANCE] = "distance",
 	[SENSOR_CHAN_CO2] = "co2",
+	[SENSOR_CHAN_O2] = "o2",
 	[SENSOR_CHAN_VOC] = "voc",
 	[SENSOR_CHAN_GAS_RES] = "gas_resistance",
 	[SENSOR_CHAN_VOLTAGE] = "voltage",

include/zephyr/drivers/sensor.h

@@ -120,6 +120,8 @@ enum sensor_channel {
 
 	/** CO2 level, in parts per million (ppm) **/
 	SENSOR_CHAN_CO2,
+	/** O2 level, in parts per million (ppm) **/
+	SENSOR_CHAN_O2,
 	/** VOC level, in parts per billion (ppb) **/
 	SENSOR_CHAN_VOC,
 	/** Gas sensor resistance in ohms. */