Implement activate and batch functions

Implements the activate and batch functions for the default Sensors
2.0 implementation.

Bug: 111070257
Test: Builds
Change-Id: I5987ab722cdd97c7cd7ff466d6d989794171b851
diff --git a/sensors/2.0/default/Android.bp b/sensors/2.0/default/Android.bp
index 3bc64e5..11612d3 100644
--- a/sensors/2.0/default/Android.bp
+++ b/sensors/2.0/default/Android.bp
@@ -20,6 +20,7 @@
     relative_install_path: "hw",
     srcs: [
         "service.cpp",
+        "Sensor.cpp",
         "Sensors.cpp",
     ],
     init_rc: ["android.hardware.sensors@2.0-service.rc"],