improve sensorservice's dumpsys

it now displays the reported trigger mode properly, as well as
the number and type of the last received data

Change-Id: I2ff64b32ab71f1332bc2e09671c8c02bb9550490
diff --git a/services/sensorservice/SensorFusion.h b/services/sensorservice/SensorFusion.h
index 3c2244e..432adbc 100644
--- a/services/sensorservice/SensorFusion.h
+++ b/services/sensorservice/SensorFusion.h
@@ -68,7 +68,7 @@
     float getPowerUsage() const;
     int32_t getMinDelay() const;
 
-    void dump(String8& result, char* buffer, size_t SIZE);
+    void dump(String8& result);
 };