cml1.bbclass: fix diffconfig diff command

cml1.bbclass: fix diffconfig diff command

Commit 6a7b98993350d0d24eae0058ae26ae19cfdf7c4c introduced a typo in
command, a whitespace was missing between --new-line-format and path to
original file. As a result, diffconfig task did not work, diff failed
with exit status 2, resulting in empty fragment.cfg.

Signed-off-by: Maciej Borzecki <maciej.borzecki@open-rnd.pl>
Signed-off-by: Maciek Borzecki <maciek.borzecki@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>