This adds a frame header byte and an enable switch to the
SPI channel struct. The current use case is so that mainboard
code can set the frame header for the CrOS EC.
BUG=none
BRANCH=none
TEST=tested on nyan (with follow-up CLs)
Signed-off-by: David Hendricks <dhendrix@chromium.org>
Change-Id: I844ebfcb6fbf16b2fc7f775086f2803e026f9d08
Reviewed-on: https://chromium-review.googlesource.com/174638
Reviewed-by: David Hendricks <dhendrix@chromium.org>
Commit-Queue: David Hendricks <dhendrix@chromium.org>
Tested-by: David Hendricks <dhendrix@chromium.org>