Update class name to MDRV2

In this sdbusplus change, [1], the class name in server.hpp was updated
from MDR_V2 to MDRV2. This updates the local class name to match.

[1]: https://github.com/openbmc/sdbusplus/commit/5011340e14da7fc04f8b20721c4631f778200edd

Change-Id: I2c00b29837a72a985b3d1cc359b1bbd952074b63
Signed-off-by: Jason M. Bills <jason.m.bills@intel.com>
diff --git a/src/mdrv2_main.cpp b/src/mdrv2_main.cpp
index 7ab907a..06a51cb 100644
--- a/src/mdrv2_main.cpp
+++ b/src/mdrv2_main.cpp
@@ -39,7 +39,7 @@
 
     bus.request_name("xyz.openbmc_project.Smbios.MDR_V2");
 
-    phosphor::smbios::MDR_V2 mdrV2(bus, phosphor::smbios::mdrV2Path, io);
+    phosphor::smbios::MDRV2 mdrV2(bus, phosphor::smbios::mdrV2Path, io);
 
     io.run();