Makefile: rename romstage linking filenames

Move final build results under $(objcbfs).
Move intermediate files under $(objgenerated).
Remove use of sed -i.

Change-Id: Ie035a1544848b26514a197c340f470201065b8d5
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: http://review.coreboot.org/859
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
1 file changed