Move overlay from buildroot into openpower/

We'd like to make some customisations to the overlay, without adding more
delta to the openpower buildroot tree.

This change updates to a buildroot tree that no longer carries the
overlay/ directory, and adds the overlay (and necessary config updates)
to our own op-build tree.

Signed-off-by: Jeremy Kerr <jk@ozlabs.org>
diff --git a/openpower/overlay/etc/inittab b/openpower/overlay/etc/inittab
new file mode 100644
index 0000000..235c835
--- /dev/null
+++ b/openpower/overlay/etc/inittab
@@ -0,0 +1,34 @@
+# /etc/inittab
+#
+# Copyright (C) 2001 Erik Andersen <andersen@codepoet.org>
+#
+# Note: BusyBox init doesn't support runlevels.  The runlevels field is
+# completely ignored by BusyBox init. If you want runlevels, use
+# sysvinit.
+#
+# Format for each entry: <id>:<runlevels>:<action>:<process>
+#
+# id        == tty to run on, or empty for /dev/console
+# runlevels == ignored
+# action    == one of sysinit, respawn, askfirst, wait, and once
+# process   == program to run
+
+# Startup the system
+null::sysinit:/bin/mount -t proc proc /proc
+null::sysinit:/bin/mount -o remount,rw / # REMOUNT_ROOTFS_RW
+null::sysinit:/bin/mkdir -p /dev/pts
+null::sysinit:/bin/mkdir -p /dev/shm
+null::sysinit:/bin/mount -a
+null::sysinit:/bin/hostname -F /etc/hostname
+# now run any rc scripts
+null::sysinit:/etc/init.d/rcS
+
+# Stuff to do for the 3-finger salute
+::ctrlaltdel:/sbin/reboot
+
+# Stuff to do before rebooting
+null::shutdown:/etc/init.d/rcK
+null::shutdown:/bin/umount -a -r
+null::shutdown:/sbin/swapoff -a
+
+null::restart:/usr/sbin/kexec-restart
diff --git a/openpower/overlay/etc/locale b/openpower/overlay/etc/locale
new file mode 100644
index 0000000..6556836
--- /dev/null
+++ b/openpower/overlay/etc/locale
@@ -0,0 +1 @@
+LANG=en_US.utf-8