at: Add systemd unit file

Signed-off-by: Khem Raj <raj.khem@gmail.com>

meta-systemd/meta-oe/recipes-extended/at/at/atd.service

@@ -0,0 +1,9 @@
+[Unit]
+Description=Job spooling tools
+After=syslog.target
+
+[Service]
+ExecStart=/usr/sbin/atd -f
+
+[Install]
+WantedBy=multi-user.target

meta-systemd/meta-oe/recipes-extended/at/at_3.1.13.bbappend

@@ -0,0 +1,12 @@
+inherit systemd
+
+PRINC := "${@int(PRINC) + 1}"
+
+# look for files in the layer first
+FILESEXTRAPATHS_prepend := "${THISDIR}/${PN}:"
+
+SRC_URI += "file://atd.service"
+
+SYSTEMD_PACKAGES = "${PN}-systemd"
+SYSTEMD_SERVICE = "atd.service"
+