Add sample systemd unit file Bios upgrade

This is a sample systemd unit file, user should provide platform
specific systemd unit file which executes flash commands.

Signed-off-by: Vijay Khemka <vijaykhemka@fb.com>
Change-Id: I1fd6836e336b6c543647ff2e3e96ad21dc0cb475
diff --git a/obmc-flash-host-bios@.service b/obmc-flash-host-bios@.service
new file mode 100644
index 0000000..13a01af
--- /dev/null
+++ b/obmc-flash-host-bios@.service
@@ -0,0 +1,7 @@
+[Unit]
+Description=Flash Host Bios image %I to Host
+
+[Service]
+Type=oneshot
+RemainAfterExit=no
+ExecStart=echo Please add custom command for flashing image /tmp/image/%i