style: function names should be lower camel

Fix function names to be lower camel.

Change-Id: I145e1f4c03d7740bc1525dcffbdce2f78fd61075
Signed-off-by: Patrick Venture <venture@google.com>
diff --git a/sensors/builder.hpp b/sensors/builder.hpp
index fdf1c9b..d646223 100644
--- a/sensors/builder.hpp
+++ b/sensors/builder.hpp
@@ -10,4 +10,4 @@
  * Build the sensors and associate them with a SensorManager.
  */
 SensorManager
-    BuildSensors(const std::map<std::string, struct SensorConfig>& config);
+    buildSensors(const std::map<std::string, struct SensorConfig>& config);