[sensorservice] Modernize codebase by replacing NULL with nullptr

Fixes -Wzero-as-null-pointer-constant warning.

Test: m
Bug: 68236239
Change-Id: I9938306410e9773243b2b9c5e2fc4afdb48b9810
diff --git a/services/sensorservice/SensorEventConnection.h b/services/sensorservice/SensorEventConnection.h
index 032721e..40c21ff 100644
--- a/services/sensorservice/SensorEventConnection.h
+++ b/services/sensorservice/SensorEventConnection.h
@@ -53,7 +53,7 @@
                           bool hasSensorAccess);
 
     status_t sendEvents(sensors_event_t const* buffer, size_t count, sensors_event_t* scratch,
-                        wp<const SensorEventConnection> const * mapFlushEventsToConnections = NULL);
+                        wp<const SensorEventConnection> const * mapFlushEventsToConnections = nullptr);
     bool hasSensor(int32_t handle) const;
     bool hasAnySensor() const;
     bool hasOneShotSensors() const;