vboot2: Add stub implementation for vb2ex_printf()

BUG=none
BRANCH=ToT
TEST=manual

  make VBOOT2=1 DEBUG=1 runtests

Change-Id: I5e99082d713e2f8ad2c56a10b86d0e0a44037549
Signed-off-by: Bill Richardson <wfrichar@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/243360
Reviewed-by: Randall Spangler <rspangler@chromium.org>
1 file changed