dts: Rename boot-stub to coreboot on all boards

cbfstool is now looking for the FMAP section "COREBOOT"
when you're not specifying a section explicitly.

BUG=none
BRANCH=none
TEST=cbfstool <image> print works again for affected boards

Signed-off-by: Stefan Reinauer <reinauer@chromium.org>
Change-Id: Ibff5a33d9298b97c58c8aa78bacf4cd711df1d94
Reviewed-on: https://chromium-review.googlesource.com/317263
Commit-Ready: Stefan Reinauer <reinauer@google.com>
Tested-by: Stefan Reinauer <reinauer@google.com>
Reviewed-by: David Hendricks <dhendrix@chromium.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-by: Patrick Georgi <pgeorgi@chromium.org>
18 files changed