BugLink: https://bugs.launchpad.net/bugs/1878232

commit fc5c796e upstream.

Commit 2d0a7add ("ARM: Kirkwood: Add support for many Synology
NAS devices") created the new file kirkwood-ds112.dts but did not
add it to the Makefile.

Fixes: 2d0a7add ("ARM: Kirkwood: Add support for many Synology NAS devices")
Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Signed-off-by: Gregory CLEMENT <gregory.clement@free-electrons.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Ian May <ian.may@canonical.com>
Signed-off-by: Kleber Sacilotto de Souza <kleber.souza@canonical.com>