Add ImageBuilder option CONFIG_SIGNED_IMAGES

Hi all, the SDK/Buildroot supports to sign created packages, however it would be very handy to sign all created images via usign. Currently only offers a GPG signed sha256sums file, however this it not suitable for devices running OpenWrt, as they usually lack an GPG installation.

I'd propose an configuration option called CONFIG_SIGNED_IMAGES for the ImabeBuilder to sign generated sha256sums via usign, calling the created file sha256sums.sig.

That feature would be very useful for my sysupgrade server project

As it's currently raining I implemented the feature myself, please see here.

TThis seems to be obsolete by using ucert and integrating signatures directly in the firmware images.

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