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This patch adds a boolean parameter "progress" to several functions.
When set (true), it will cause usb_bulk_send() to notify the progress
framework, using progress_update() to convey the current transfer
status.

The feature gets enabled for the "write" command, and is forced
inactive in most other places, e.g. aw_fel_write_uboot_image().
Also, we specifically want the internal use of aw_fel_write() to
never use it.
Signed-off-by: Bernhard Nortmann <bernhard.nortmann@web.de>
Reviewed-by: Siarhei Siamashka <siarhei.siamashka@gmail.com>