cbfstool: add --xip support to add-stage for x86

Instead of going through the locate then add-stage
dance while linking romstage twice allow for adding romstage
with --xip flags to perform the relocation while adding it
into CBFS. The -P (page-size) and -a (alignment) parameters
were added as well so one could specify the necessary
parameters for x86 romstage.

BUG=chrome-os-partner:44827
BRANCH=None
TEST=Built and booted on glados.

Change-Id: I585619886f257e35f00961a1574009a51c28ff2b
Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: http://review.coreboot.org/11669
Tested-by: build bot (Jenkins)
Reviewed-by: Patrick Georgi <pgeorgi@google.com>

util/cbfstool/Makefile.inc

@@ -6,6 +6,7 @@ cbfsobj += cbfs_image.o
 cbfsobj += cbfs-mkstage.o
 cbfsobj += cbfs-mkpayload.o
 cbfsobj += elfheaders.o
+cbfsobj += rmodule.o
 cbfsobj += xdr.o
 cbfsobj += fit.o
 cbfsobj += partitioned_file.o