add first boot set mac script

phosphor-misc will use the meson build system - establish the initial
structure.  Copy the first boot set mac script and systemd unit from
meta-openpower.

Change-Id: I1f7ebbb6b5230aa97b28e9a46ac721925b95a75a
Signed-off-by: Brad Bishop <bradleyb@fuzziesquirrel.com>
diff --git a/meson_options.txt b/meson_options.txt
new file mode 100644
index 0000000..a946e82
--- /dev/null
+++ b/meson_options.txt
@@ -0,0 +1,3 @@
+option(
+    'first-boot-set-mac', type: 'feature', description: 'Set MAC address on first boot.',
+)