[PATCH v2 4/7] binman: Override CheckOptional in fit entry

[Simon Glass]

Missing optional blobs was not reported for generated entries, e.g.
tee-os on rockchip targets. Implement a CheckOptional to fix this.

After this the following can be shown:

  Image 'simple-bin' is missing optional external blobs but is still
functional: tee-os

  /binman/simple-bin/fit/images/@tee-SEQ/tee-os (tee-os):
     See the documentation for your board. You may need to build Open Portable
     Trusted Execution Environment (OP-TEE) and build with TEE=/path/to/tee.bin

Signed-off-by: Jonas Karlman <jonas at kwiboo.se>
Reviewed-by: Simon Glass <sjg at chromium.org>
---
v2:
- Add test
- Collect r-b tag

 tools/binman/etype/fit.py                | 7 +++++++
 tools/binman/ftest.py                    | 7 +++++++
 tools/binman/test/264_tee_os_opt_fit.dts | 1 +
 3 files changed, 15 insertions(+)

Applied to u-boot-dm, thanks!