Remove "using namespace SensorServiceUtil"

The SensorService was polluting the android namespace by "using
namespace SensorServiceUtil".

Bug: 116026128
Test: Compiles, a_sns_test receives events
Change-Id: Iec353322cb73f48f7ac38a959730e85e8fd5bce0
diff --git a/services/sensorservice/SensorService.cpp b/services/sensorservice/SensorService.cpp
index 372b609..3822ee1 100644
--- a/services/sensorservice/SensorService.cpp
+++ b/services/sensorservice/SensorService.cpp
@@ -306,7 +306,7 @@
     int handle = s->getSensor().getHandle();
     int type = s->getSensor().getType();
     if (mSensors.add(handle, s, isDebug, isVirtual)){
-        mRecentEvent.emplace(handle, new RecentEventLogger(type));
+        mRecentEvent.emplace(handle, new SensorServiceUtil::RecentEventLogger(type));
         return s->getSensor();
     } else {
         return mSensors.getNonSensor();