raiden_debug: Upstream ChromiumOS servo debug board prog

Initial check-in of the Raiden debugger programmer.

Squash in,
  raiden_debug: Add missing .write_aai cb fn
  raiden_debug: greatly improve protocol documentation

BUG=b:143389556
BRANCH=none
TEST=builds

Change-Id: Ifad273a708acea4de797a0808be58960635a8864
Signed-off-by: Edward O'Callaghan <quasisec@google.com>
Reviewed-on: https://review.coreboot.org/c/flashrom/+/38209
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
6 files changed