meta-google: Add eMMC systemd service

This service launches eStoraged for the eMMC.

Tested:
Installed the image on a machine and confirmed that the systemd service
started automatically.

Signed-off-by: John Wedig <johnwedig@google.com>
Change-Id: I55567da8ef491af893e1749ee05d2f39fa01758b
diff --git a/meta-google/recipes-google/storage/emmc-service/emmc.service b/meta-google/recipes-google/storage/emmc-service/emmc.service
new file mode 100644
index 0000000..5447251
--- /dev/null
+++ b/meta-google/recipes-google/storage/emmc-service/emmc.service
@@ -0,0 +1,10 @@
+[Unit]
+Description=Storage management daemon for eMMC
+
+[Service]
+Type=simple
+Restart=always
+ExecStart=/usr/bin/eStoraged -b /dev/mmcblk0
+
+[Install]
+WantedBy=multi-user.target