samples: sensor: Extend magn_polling to support additional drivers

Extends the magn_polling sample application to support additional
magnetometer drivers. This is a first step towards reducing the number
of driver-specific sensor sample applications.

Integration platforms were selected to exercise different magnetometer
drivers.

Tested on hardware with the following configurations:
- fxos8700 driver with the on-board sensor on the frdm_k64f board
- lis2mdl driver with a x_nucleo_iks01a3 shield attached to a frdm_k64f
  board

Signed-off-by: Maureen Helm <maureen.helm@intel.com>

samples/sensor/magn_polling/prj.conf

@@ -1,5 +1,3 @@
 CONFIG_STDOUT_CONSOLE=y
-CONFIG_I2C=y
 CONFIG_SENSOR=y
-CONFIG_BMC150_MAGN=y
 CONFIG_CBPRINTF_FP_SUPPORT=y

samples/sensor/magn_polling/sample.yaml

@@ -1,8 +1,13 @@
 sample:
-  name: BMC150 Magnetometer Sample
+  name: Magnetometer Polling Sample
 tests:
   sample.sensor.magn_polling:
     harness: sensor
     tags: sensors
-    depends_on: i2c
-    filter: dt_compat_enabled("bosch,bmc150_magn")
+    filter: dt_alias_exists("magn0")
+    integration_platforms:
+      - frdm_k64f               # fxos8700
+      - thingy53_nrf5340_cpuapp # bmm150
+      - sensortile_box          # lis2mdl
+      - stm32f411e_disco        # lsm303agr_magn
+      - stm32f3_disco           # lsm303dlhc_magn

samples/sensor/magn_polling/src/main.c

@@ -12,7 +12,7 @@
 
 void main(void)
 {
-	const struct device *dev = DEVICE_DT_GET_ONE(bosch_bmc150_magn);
+	const struct device *dev = DEVICE_DT_GET(DT_ALIAS(magn0));
 	struct sensor_value value_x, value_y, value_z;
 	int ret;
 
@@ -21,6 +21,8 @@ void main(void)
 		return;
 	}
 
+	printk("Polling magnetometer data from %s.\n", dev->name);
+
 	while (1) {
 		ret = sensor_sample_fetch(dev);
 		if (ret) {