drivers: sensor: migrate simulated sensors to DEVICE_API

Upstream Zephyr moved device API structs into per-class iterable linker
sections and made the sensor accessors resolve the API through
DEVICE_API_GET(sensor, dev). With CONFIG_DEVICE_API_ASSERT enabled
(default when CONFIG_ASSERT=y) this asserts that dev->api points inside
the _sensor_driver_api section, otherwise it fails at runtime with
"device API is not sensor".

The Nordic sensor_sim and sensor_stub drivers still declared their API
as a plain "static const struct sensor_driver_api", so the struct was
not placed in that section and the assert fired the first time the CAF
sensor manager called sensor_sample_fetch(). This broke the
caf_sensor_manager.core test (sensor_sim) and the caf_sensor_manager
sample (sensor_stub) on qemu_cortex_m3 after the upmerge.

Declared both driver APIs with DEVICE_API(sensor, ...), matching the
idiom used by all upstream sensor drivers, so the API lands in the
_sensor_driver_api iterable section and passes the runtime check.

Ref: NCSDK-40421

Signed-off-by: Kamil Piszczek <Kamil.Piszczek@nordicsemi.no>

Author: kapi-no

drivers/sensor/sensor_sim/sensor_sim.c

@@ -519,7 +519,7 @@ static int sensor_sim_channel_get(const struct device *dev,
 	return 0;
 }
 
-static const struct sensor_driver_api sensor_sim_api_funcs = {
+static DEVICE_API(sensor, sensor_sim_api_funcs) = {
 	.sample_fetch = sensor_sim_sample_fetch,
 	.channel_get = sensor_sim_channel_get,
 #if defined(CONFIG_SENSOR_SIM_TRIGGER)

drivers/sensor/sensor_stub/sensor_stub.c

@@ -62,7 +62,7 @@ static int sensor_stub_init(const struct device *dev)
 	extern int _CONCAT(DT_STRING_TOKEN(DT_DRV_INST(_idx), generator), _init)(                  \
 		const struct device *dev);                                                         \
 												   \
-	static const struct sensor_driver_api sensor_stub_api_funcs_##_idx = {                     \
+	static DEVICE_API(sensor, sensor_stub_api_funcs_##_idx) = {                                \
 		.sample_fetch = _CONCAT(DT_STRING_TOKEN(DT_DRV_INST(_idx), generator), _fetch),    \
 		.channel_get  = _CONCAT(DT_STRING_TOKEN(DT_DRV_INST(_idx), generator), _get)       \
 	};                                                                                         \