vboot/ui: Display error for untrusted confirmation

Display a error dialog box while user confirms with untrusted keyboard.

BUG=b:144969091, b:161866932
BRANCH=puff
TEST=PHYSICAL_PRESENCE_KEYBOARD=1; emerge-puff depthcharge

Cq-Depend: chromium:2345837
Signed-off-by: Hsuan Ting Chen <roccochen@chromium.org>
Change-Id: I2b0fdc217bbaa23ac71a41bf400c412be634ec0c
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/vboot_reference/+/2346455
Reviewed-by: Yu-Ping Wu <yupingso@chromium.org>
Reviewed-by: Joel Kitching <kitching@chromium.org>
2 files changed