Add MCTP service file

Previous service file for this repo are contained
in the corresponding meta layer.
Now move it into the repository that owns them.

Signed-off-by: Xiaochao Ma <maxiaochao@inspur.com>
Change-Id: I15d85815483da19b08869225eb50866b49fe5575
diff --git a/Makefile.am b/Makefile.am
index 3994ff0..c93d452 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -15,6 +15,11 @@
 include_HEADERS += libmctp-astlpc.h
 endif
 
+if HAVE_SYSTEMD
+systemdsystemunit_DATA = \
+	mctp-demux.service
+endif
+
 bin_PROGRAMS = utils/mctp-demux-daemon
 utils_mctp_demux_daemon_LDADD = libmctp.la