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/dbus/util.hpp b/dbus/util.hpp
index 41a0af1..67125b9 100644
--- a/dbus/util.hpp
+++ b/dbus/util.hpp
@@ -77,9 +77,9 @@
                             const std::string& path) override;
 };
 
-std::string GetSensorPath(const std::string& type, const std::string& id);
-std::string GetMatch(const std::string& type, const std::string& id);
-bool ValidType(const std::string& type);
+std::string getSensorPath(const std::string& type, const std::string& id);
+std::string getMatch(const std::string& type, const std::string& id);
+bool validType(const std::string& type);
 
 struct VariantToFloatVisitor
 {