[PATCH v3 14/46] boot: Convert IMAGE_FORMAT into an enum

[Simon Glass]

Use an enum so it is clearer that these options are related. Update
genimg_get_format(), tidy up the function comment and move it to the
header file, since it is exported.

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

Changes in v3:
- Add new patch to convert IMAGE_FORMAT into an enum

 boot/image-board.c | 18 +++---------------
 include/image.h    | 26 +++++++++++++++++++++-----
 2 files changed, 24 insertions(+), 20 deletions(-)

Applied to sjg/master, thanks!