bcm4908img is a tool managing BCM4908 platform images. It's used for
creating them as well as checking, modifying and extracting data from.
It's required by both: host (for building firmware images) and target
(for sysupgrade purposes). Make it a host/target package.
Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
(cherry picked from commit 9b4fc4cae9)
