Use separated images for fixed flash layout

For fixed flash layout code update, it was using the whole image-bmc.
For future features like image verification during boot, it needs to use
separated images and separated keys.

So change the image-bmc to separated images.

Change-Id: I6cc56f82c786125bb4386af5ea1d931afed7901d
Tested: Do code update on Romulus without issue.
Signed-off-by: Lei YU <mine260309@gmail.com>
2 files changed