The readonly sshd config sshd_config_readonly needs to be created from
the installed sshd_config as make install will adjust the paths in
the config file. This fixes the path for sftp-server being correct
in sshd_config but incorrect in sshd_config_readonly.
(From OE-Core rev: 400b4bce34ffb76e500e2195104cc200218aa4c3)
Signed-off-by: Jonathan Liu <net147@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>