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/SensorDevice.h b/services/sensorservice/SensorDevice.h
index c0b357d..ca67ce2 100644
--- a/services/sensorservice/SensorDevice.h
+++ b/services/sensorservice/SensorDevice.h
@@ -57,7 +57,7 @@
     status_t activate(void* ident, int handle, int enabled);
     status_t setDelay(void* ident, int handle, int64_t ns);
     status_t resetStateWithoutActuatingHardware(void *ident, int handle);
-    void dump(String8& result, char* buffer, size_t SIZE);
+    void dump(String8& result);
 };
 
 // ---------------------------------------------------------------------------