firmware-utils: new package replacing otrx

firmware-utils: new package replacing otrx

Some of firmware utils may be required on target devices. It's useful
e.g. for dealing with some firmware formats. That is often required
(supporting specific format) to provide an option to revert to original
firmware.

So far we had packaged "otrx" util only for use on Broadcom targets.
Refactor that to package the whole firmware-utils project so we can
package any single util needed.

Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
(cherry picked from commit 24d6abe2d7cd8b93ee5e390af8d90eda54611dd1)