various fixes to the sensorservice

1) "google" sensors are now reporting AOSP as the vendor string
2) don't expose the system's sensor fusion if the HAL provides it
3) use uncalibrated gyro if availble for the system's sensor fusion

Change-Id: I25140436cdb29d55e39fd6fbbf8c44a410a83d5c
diff --git a/services/sensorservice/CorrectedGyroSensor.cpp b/services/sensorservice/CorrectedGyroSensor.cpp
index 1857443..09f60a9 100644
--- a/services/sensorservice/CorrectedGyroSensor.cpp
+++ b/services/sensorservice/CorrectedGyroSensor.cpp
@@ -69,7 +69,7 @@
 Sensor CorrectedGyroSensor::getSensor() const {
     sensor_t hwSensor;
     hwSensor.name       = "Corrected Gyroscope Sensor";
-    hwSensor.vendor     = "Google Inc.";
+    hwSensor.vendor     = "AOSP";
     hwSensor.version    = 1;
     hwSensor.handle     = '_cgy';
     hwSensor.type       = SENSOR_TYPE_GYROSCOPE;