Change in coreboot[master]: Makefile.inc: Update the master header pointer in a separate target

[Arthur Heymans (Code Review)]

Attention is currently required from: Martin Roth, Julius Werner, Arthur Heymans, Yu-Ping Wu.
Arthur Heymans has uploaded a new patch set (#3) to the change originally created by Arthur Heymans. ( https://review.coreboot.org/c/coreboot/+/59132 )

Change subject: Makefile.inc: Update the master header pointer in a separate target
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Makefile.inc: Update the master header pointer in a separate target

The makefiles don't like cbfs file names with spaces in them so update
the file name with '_' instead of spaces. To keep the master header at
the top of cbfs, add a placeholder.

Change-Id: I3ba01be7da1f09a8cac287751497c18cda97d293
Signed-off-by: Arthur Heymans 
---
M Makefile.inc
M src/security/vboot/Makefile.inc
M util/cbfstool/cbfstool.c
3 files changed, 25 insertions(+), 12 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/32/59132/3