PLDM:Use new alias of DBUS_TIMEOUT for bus.call

This commit uses a new global variable for DBUS_TIMEOUT which is included as an input parameter for bus.call dbus calls. The new alias makes the bus.call function shorter and readable.

Change-Id: I336c97bc0631d5370ff3648e41f50e3e283d771b
Signed-off-by: vkaverap@in.ibm.com <vkaverap@in.ibm.com>
diff --git a/oem/ibm/libpldmresponder/file_io_type_vpd.cpp b/oem/ibm/libpldmresponder/file_io_type_vpd.cpp
index 9c14c33..e136214 100644
--- a/oem/ibm/libpldmresponder/file_io_type_vpd.cpp
+++ b/oem/ibm/libpldmresponder/file_io_type_vpd.cpp
@@ -38,7 +38,7 @@
                                           "org.freedesktop.DBus.Properties",
                                           "Get");
         method.append(keywrdInterface, keywrdPropName);
-        auto reply = bus.call(method);
+        auto reply = bus.call(method, dbusTimeout);
         reply.read(keywrd);
     }
     catch (const std::exception& e)