vboot: stop using wpsw_boot and remove it from crossystem

wpsw_boot is being deprecated, so just use wpsw_cur.

BUG=b:124141368, chromium:950273
TEST=make clean && make runtests
BRANCH=none

Change-Id: Iae63b2a76b19629a9ecd9b87e5dd6367767860b3
Cq-Depend: chromium:2066154, chromium:2068241, chromium:2068209
Cq-Depend: chromium:2068297, chromium:2067229, chromium:2067231
Cq-Depend: chromium:2068242
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/vboot_reference/+/2066192
Tested-by: Joel Kitching <kitching@chromium.org>
Reviewed-by: Julius Werner <jwerner@chromium.org>
Reviewed-by: Hung-Te Lin <hungte@chromium.org>
Commit-Queue: Joel Kitching <kitching@chromium.org>
6 files changed