[PATCH 3/8] binman: Add a null entry

[Simon Glass]

It is sometimes useful to define an entry which does not have its own
contents but does appear in the image. The contents are set by the section
which contains it, even though it appears as an entry in the fdtmap.

Add support for this.

Signed-off-by: Simon Glass <sjg at chromium.org>
---

 tools/binman/entries.rst       | 13 +++++++++++++
 tools/binman/entry.py          |  5 +++--
 tools/binman/etype/null.py     | 25 +++++++++++++++++++++++++
 tools/binman/etype/section.py  |  6 ++++++
 tools/binman/ftest.py          |  5 +++++
 tools/binman/test/268_null.dts | 19 +++++++++++++++++++
 6 files changed, 71 insertions(+), 2 deletions(-)
 create mode 100644 tools/binman/etype/null.py
 create mode 100644 tools/binman/test/268_null.dts

Applied to u-boot-dm, thanks!