A separate u-boot-extlinux package is created for the extlinux.conf file
so that it can be installed on its own if needed. If this package is
populated, it is added as a dependency of the main u-boot package so
that installing just u-boot still results in the extlinux.conf file
being present in the rootfs.
Signed-off-by: Paul Barker <paul@pbarker.dev> Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
