sdbusplus: replace message::variant with std::variant

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: If7c54cfe20a84fa91aacc309ebfa804231078bf7
diff --git a/host_state_manager.cpp b/host_state_manager.cpp
index c333032..e2d8010 100644
--- a/host_state_manager.cpp
+++ b/host_state_manager.cpp
@@ -135,7 +135,7 @@
 
 bool Host::stateActive(const std::string& target)
 {
-    sdbusplus::message::variant<std::string> currentState;
+    std::variant<std::string> currentState;
     sdbusplus::message::object_path unitTargetPath;
 
     auto method = this->bus.new_method_call(SYSTEMD_SERVICE, SYSTEMD_OBJ_PATH,
@@ -191,7 +191,7 @@
     {
         auto reply = bus.call(method);
 
-        sdbusplus::message::variant<bool> result;
+        std::variant<bool> result;
         reply.read(result);
         auto autoReboot = std::get<bool>(result);
         auto rebootCounterParam = reboot::RebootAttempts::attemptsLeft();