libmctp: Add subdirectory for systemd metadata

Signed-off-by: Andrew Jeffery <andrew@aj.id.au>
Change-Id: I0989331aff807928fc23a4b298ef97c491714093
diff --git a/Makefile.am b/Makefile.am
index 6011a8e..f4c8017 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -18,7 +18,7 @@
 
 if HAVE_SYSTEMD
 systemdsystemunit_DATA = \
-	mctp-demux.service
+	systemd/system/mctp-demux.service
 endif
 
 bin_PROGRAMS = utils/mctp-demux-daemon
diff --git a/mctp-demux.service b/systemd/system/mctp-demux.service
similarity index 100%
rename from mctp-demux.service
rename to systemd/system/mctp-demux.service