Add systemd units for monitor and presence

Change-Id: I77593fe6b7927511042aeebff17519719c0742e3
Signed-off-by: Brad Bishop <bradleyb@fuzziesquirrel.com>
diff --git a/phosphor-gpio-monitor@.service b/phosphor-gpio-monitor@.service
new file mode 100644
index 0000000..c1846f8
--- /dev/null
+++ b/phosphor-gpio-monitor@.service
@@ -0,0 +1,7 @@
+[Unit]
+Description=Phosphor GPIO %I monitor
+
+[Service]
+Restart=no
+EnvironmentFile=/etc/default/obmc/gpio/%I
+ExecStart=/usr/bin/phosphor-gpio-monitor --path=${{DEVPATH}} --key=${{KEY}} --polarity=${{POLARITY}} --target=${{TARGET}} ${{EXTRA_ARGS}}