zram: Add systemd service for zram

Signed-off-by: Andrei Gherzan <andrei@gherzan.ro>
Signed-off-by: Koen Kooi <koen@dominion.thruhere.net>

meta-systemd/meta-oe/recipes-extended/zram/zram/zram.service

@@ -0,0 +1,12 @@
+[Unit]
+Description=Enable zram compressed in-memory swap.
+After=multi-user.target
+
+[Service]
+RemainAfterExit=yes
+ExecStart=/usr/bin/zram-load.sh --load
+ExecStop=/usr/bin/zram-load.sh --unload
+Type=oneshot
+
+[Install]
+WantedBy=multi-user.target

meta-systemd/meta-oe/recipes-extended/zram/zram_0.1.bbappend

@@ -0,0 +1,12 @@
+FILESEXTRAPATHS_prepend := "${THISDIR}/${PN}:"
+
+PRINC := "${@int(PRINC) + 1}"
+
+inherit systemd
+
+SRC_URI += " \
+        file://zram.service \
+"
+
+SYSTEMD_PACKAGES = "${PN}-systemd"
+SYSTEMD_SERVICE_${PN}-systemd = "zram.service"