Remove systemd meson configuration variables

This commit removes meson configuration variables which are not actually
configurable and can be hardcoded.

Change-Id: Id9d198bf6562e108b8a7472e770e6d8bb84e2684
Signed-off-by: Ravi Teja <raviteja28031990@gmail.com>
diff --git a/phosphor-ldap-config/ldap_config_mgr.cpp b/phosphor-ldap-config/ldap_config_mgr.cpp
index eec8579..f0630f6 100644
--- a/phosphor-ldap-config/ldap_config_mgr.cpp
+++ b/phosphor-ldap-config/ldap_config_mgr.cpp
@@ -17,6 +17,10 @@
 namespace ldap
 {
 
+constexpr auto systemdBusname = "org.freedesktop.systemd1";
+constexpr auto systemdObjPath = "/org/freedesktop/systemd1";
+constexpr auto systemdInterface = "org.freedesktop.systemd1.Manager";
+
 constexpr auto nslcdService = "nslcd.service";
 constexpr auto nscdService = "nscd.service";
 constexpr auto ldapScheme = "ldap";
@@ -49,8 +53,8 @@
 {
     try
     {
-        auto method = bus.new_method_call(SYSTEMD_BUSNAME, SYSTEMD_PATH,
-                                          SYSTEMD_INTERFACE, "RestartUnit");
+        auto method = bus.new_method_call(systemdBusname, systemdObjPath,
+                                          systemdInterface, "RestartUnit");
         method.append(service.c_str(), "replace");
         bus.call_noreply(method);
     }
@@ -65,8 +69,8 @@
 {
     try
     {
-        auto method = bus.new_method_call(SYSTEMD_BUSNAME, SYSTEMD_PATH,
-                                          SYSTEMD_INTERFACE, "StopUnit");
+        auto method = bus.new_method_call(systemdBusname, systemdObjPath,
+                                          systemdInterface, "StopUnit");
         method.append(service.c_str(), "replace");
         bus.call_noreply(method);
     }