Update the registered IPMI method name

Update registered IPMI method names to use `Lower Camel Case`.

Change-Id: I5539771c4ba8567f6cdb22aa3c8df58db5e883f2
Signed-off-by: George Liu <liuxiwei@ieisystem.com>
diff --git a/apphandler.cpp b/apphandler.cpp
index 9bad7ff..3219a72 100644
--- a/apphandler.cpp
+++ b/apphandler.cpp
@@ -57,7 +57,7 @@
     "xyz.openbmc_project.Software.Activation";
 static constexpr auto softwareRoot = "/xyz/openbmc_project/software";
 
-void register_netfn_app_functions() __attribute__((constructor));
+void registerNetFnAppFunctions() __attribute__((constructor));
 
 using namespace phosphor::logging;
 using namespace sdbusplus::error::xyz::openbmc_project::common;
@@ -1782,7 +1782,7 @@
     return ipmi::responseSuccess(readBuf);
 }
 
-void register_netfn_app_functions()
+void registerNetFnAppFunctions()
 {
     // <Get Device ID>
     ipmi::registerHandler(ipmi::prioOpenBmcBase, ipmi::netFnApp,