x86 makefile: Use preprocessed linker files

The top level Makefile runs the $stage-src .ld scripts through
the preprocessor and puts them in $(obj). Use the preprocessed
.ld files and cat them together into x86 romstage_null.ld.

Change-Id: If71240fbf7231df2b1333a1f8e5160cb8694f6ce
Signed-off-by: Marc Jones <marc.jones@se-eng.com>
Reviewed-on: http://review.coreboot.org/10743
Tested-by: build bot (Jenkins)
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
1 file changed