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Add a MCUboot-based USB firmware update sample for ThreadX #74

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@fdesbiens

I'd like SampleX to show an end-to-end firmware update for a ThreadX application using MCUboot and USBX. MCUboot can already boot ThreadX applications, but I have not found a SampleX example that brings the bootloader, USB update path, and image handling together. This follows eclipse-threadx/threadx#458.

I'd welcome a contribution for a development board with suitable USB and flash support. The sample should show how to build and sign an image, deliver it over USB, install it with MCUboot, and recover from an unconfirmed update. I'd include FileX if the chosen workflow stages the image as a file. I'd also document the board, flash layout, and steps needed to reproduce the update.

I think this would be useful, but I don't have time to implement it right now. I can help review a proposed approach or contribution.

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