meson: build: Install systemd unit files

Tested: Verified the expected systemd service files were installed
        with -Dhost-bios-upgrade=enabled and -Dbmc-layout=ubi

Change-Id: I1a46dc3916da208ded9c07af60d7e6856d1fa0ee
Signed-off-by: Adriana Kobylak <anoo@us.ibm.com>
diff --git a/ubi/meson.build b/ubi/meson.build
index 5045dee..f2caf78 100644
--- a/ubi/meson.build
+++ b/ubi/meson.build
@@ -2,3 +2,24 @@
     'flash.cpp',
     'item_updater_helper.cpp'
 )
+
+ubi_unit_files = [
+    'obmc-flash-bmc-cleanup.service',
+    'obmc-flash-bmc-mirroruboot.service',
+    'obmc-flash-bmc-ubiremount.service',
+    'obmc-flash-bmc-ubiro@.service',
+    'obmc-flash-bmc-ubiro-remove@.service',
+    'obmc-flash-bmc-ubirw.service',
+    'obmc-flash-bmc-ubirw-remove.service',
+    'obmc-flash-bmc-updateubootvars@.service'
+]
+
+foreach u : ubi_unit_files
+    configure_file(
+        copy: true,
+        input: u,
+        install: true,
+        install_dir: systemd_system_unit_dir,
+        output: u,
+    )
+endforeach