[U-Boot] [PATCH v2 27/37] binman: Support ELF files for TPL

[sjg at google.com]

We currenty support using the ELF file in U-Boot proper and SPL, but not
TPL. Add this as it is useful both with sandbox and for CBFS to allow
adding TPL as a 'stage'.

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

Changes in v2: None

 tools/binman/README.entries          | 11 +++++++++++
 tools/binman/etype/u_boot_tpl_elf.py | 24 ++++++++++++++++++++++++
 tools/binman/ftest.py                |  2 ++
 tools/binman/test/096_elf.dts        |  2 ++
 4 files changed, 39 insertions(+)
 create mode 100644 tools/binman/etype/u_boot_tpl_elf.py

Applied to u-boot-dm, thanks!