Currently, bcm63xx-cfe is being installed into kernel build dir, however
that does not work for Image Builder as only certain artifacts from kernel
build dir are included in Image Builder.
So, simply install bcm63xx-cfe into image staging dir so its artifacts can
be used in Image Builder as well.
Fixes: #18408Fixes: #18409
Link: https://github.com/openwrt/openwrt/pull/18463
Signed-off-by: Robert Marko <robimarko@gmail.com>
4a7de50769