dediprog: wait for spi bulk read xfers to finish

dediprog_bulk_read_poll()'s finish argument allows it to be used in two
distinct cases: where dediprog_bulk_read_poll will be called as part of
a loop (finish=0) and where dediprog_bulk_read_poll should wait for all
outstanding transfers to finish (finish=1).  In both cases,
dediprog_bulk_read_poll() calls libusb to process events with a 10
second timeout.

After dediprog_spi_bulk_read() has queued the last transfers, it calls
dediprog_bulk_read_poll() with finish=0 when it should be finish=1.
finish=0 just happens to work because frequently the transfers finish in
the 10 second timeout.

Signed-off-by: Rick Altherr <rick@oxidecomputer.com>
Change-Id: If7cb541742c8620358c8e04275d8316131b2d1ab
Reviewed-on: https://review.coreboot.org/c/flashrom/+/60087
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-by: Nico Huber <nico.h@gmx.de>

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