uboot-sign: Refactor do_deploy prefunc to do_deploy_prepend
When inherited by the u-boot recipe (UBOOT_PN), uboot-sign.bbclass adds
a concat_dtb step, which places additional files into ${DEPLOYDIR}
before do_deploy. By turning this from a prefunc into a part of the normal
do_deploy function, it becomes possible to use
do_deploy[cleandirs] = "${DEPLOYDIR}"
in the future, without deleting the files produced by concat_dtb.
As before, care is taken to not interfere with the kernel's do_deploy
definition, since concat_dtb was only needed for u-boot.
Signed-off-by: Daniel Klauer <daniel.klauer@gin.de> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
