updateservice: add start-update meson option

Add the meson option for the start-update D-Bus interface feature to be
used in UpdateService. More more details refer to -
https://gerrit.openbmc.org/c/openbmc/phosphor-dbus-interfaces/+/65738
https://gerrit.openbmc.org/c/openbmc/docs/+/65739

Tested: Build passes.

Change-Id: I594ddc0d2df6c032823eaeba9429cf50047d5dcd
Signed-off-by: Jagpal Singh Gill <paligill@gmail.com>
diff --git a/config/meson.build b/config/meson.build
index 4b862b4..9f66d0e 100644
--- a/config/meson.build
+++ b/config/meson.build
@@ -33,6 +33,7 @@
     'redfish-new-powersubsystem-thermalsubsystem',
     'redfish-oem-manager-fan-data',
     'redfish-provisioning-feature',
+    'redfish-updateservice-use-dbus',
     'redfish',
     'rest',
     'session-auth',