cr50: Use own CCD EXT state machine

The state machine in common/case_closed_debug.c only handles a subset
of what we need to do for Cr50 external case closed debugging, and
also supports a 'partial' CCD state that doesn't exist for Cr50.  Move
the few lines of code from that we actually need into our file.

BUG=none
BRANCH=cr50
TEST=manual
	Assert CCD_MODE_L
	See 'CCD EXT enable'
	Confirm Cr50 console appears as a RW /dev/ttyUSBn endpoint
	Confirm firmware update over USB works

	Deassert CCD_MODE_L
	See 'CCD EXT disable'
	Confirm Cr50 console appears as a RW /dev/ttyUSBn endpoint
	Confirm firmware update over USB does not work (can't find device)

Change-Id: Id96f2770632839a9690740ece54bc2eb71d39a38
Signed-off-by: Randall Spangler <rspangler@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/647909
Reviewed-by: Mary Ruthven <mruthven@chromium.org>

0 files changed, 0 insertions, 0 deletions