native frameworks: 64-bit compile issues

- Fix format (print/scanf)
- Suppress unused argument warning messages (bonus)

Change-Id: I05c7724d2aba6da1e82a86000e11f3a8fef4e728
diff --git a/services/sensorservice/SensorFusion.cpp b/services/sensorservice/SensorFusion.cpp
index 03f94be..bb97286 100644
--- a/services/sensorservice/SensorFusion.cpp
+++ b/services/sensorservice/SensorFusion.cpp
@@ -147,7 +147,7 @@
 
 void SensorFusion::dump(String8& result) {
     const Fusion& fusion(mFusion);
-    result.appendFormat("9-axis fusion %s (%d clients), gyro-rate=%7.2fHz, "
+    result.appendFormat("9-axis fusion %s (%zd clients), gyro-rate=%7.2fHz, "
             "q=< %g, %g, %g, %g > (%g), "
             "b=< %g, %g, %g >\n",
             mEnabled ? "enabled" : "disabled",