Dash's 'echo' command expands '\n' by default, so the '\n' is not
included in the '/etc/issue' file.
Use 'printf' for portability between different shells.
(From OE-Core rev: 52969714484fc96f6ece928304913b8f3ae30314)
Signed-off-by: Javier Viguera <javier.viguera@digi.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>