vboot_aux_fw: Add new return code to handle busy case

We do not want to upgrade the TCPC firmware if the TCPC is the only
source of power. Use this new return code to communicate to depthcharge
that we do not want upgrade at this time.

TEST=if PS8751 is the only source of power, then upgrade will gracefully

Signed-off-by: Duncan Laurie <dlaurie@google.com>
Original-Commit-Id: d0d0cf82ee95c353d6dd988303da77fb7b1ecc06
Original-Change-Id: I062c79a2d01f779c30873d48ff4301aca071cca3
Original-Signed-off-by: Jett Rink <jettrink@chromium.org>
Original-Reviewed-on: https://chromium-review.googlesource.com/1123105
Original-Reviewed-by: Simon Glass <sjg@chromium.org>
Original-Reviewed-by: Furquan Shaikh <furquan@chromium.org>
Original-Reviewed-by: Duncan Laurie <dlaurie@google.com>
(cherry picked from commit d0d0cf82ee95c353d6dd988303da77fb7b1ecc06)

Change-Id: I039f757b27047378a72274bc36d240f4cb584823
Reviewed-on: https://chromium-review.googlesource.com/c/1338370
Reviewed-by: Duncan Laurie <dlaurie@google.com>
Commit-Queue: Duncan Laurie <dlaurie@google.com>
Tested-by: Duncan Laurie <dlaurie@google.com>
Trybot-Ready: Duncan Laurie <dlaurie@google.com>
1 file changed