vboot/ui: introduce casts around vb2_menu_item helpers

Follow same style as MENU_ITEMS macro for clarity and safety.

BUG=b:146399181
TEST=make clean && make runtests
BRANCH=none

Signed-off-by: Joel Kitching <kitching@google.com>
Change-Id: I9aac27dca763c98fd5ca7e35219163d990c73ab0
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/vboot_reference/+/2428202
Tested-by: Joel Kitching <kitching@chromium.org>
Reviewed-by: Yu-Ping Wu <yupingso@chromium.org>
Reviewed-by: Hsuan Ting Chen <roccochen@chromium.org>
Commit-Queue: Joel Kitching <kitching@chromium.org>
1 file changed