If the initramfs image is type lz4, then a native lz4 is needed.
Additionally an output filename needs to be specified when calling lz4,
otherwise STDOUT will be used implicitly.
(From OE-Core rev: c83a7aec59defbbc049d44ba34a7a409ada4fa19)
Signed-off-by: Timon Ulrich <t.ulrich@anapur.de>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>