Add a new Kconfig variable to enable the generation of position and alignment attributes for cbfs files which has constraints on this parameters. In addition, modify Makefile.inc to support that option. Change-Id: Ibd725fe69a4de35964bdb2dde106d9a7c37ffb47 Signed-off-by: Werner Zeh <werner.zeh@siemens.com> Reviewed-on: https://review.coreboot.org/12968 Tested-by: build bot (Jenkins) Reviewed-by: Aaron Durbin <adurbin@chromium.org>