bcm27xx: update manifest aliases (#3110)

As the boardname-based image name setting was broken for bcm27xx due to the
target rename, we need to keep the model-based names updated for now.

Add all model strings currently seen on the Multimeshviewer and update
the comments accordingly.

(cherry picked from commit 20c2adae)
[adjust comment from 2023.1 to 2023.1.1]
Signed-off-by: Tom Herbers <mail@tomherbers.de>