vboot/ui: Pass screen and locale_id to vb2ex_prepare_log_screen()

To support multi-line title for log screens, we need to support
different size of log box in each screen. Therefore, pass the screen and
locale information to vb2ex_prepare_log_screen() so that the number of
lines per page can be determined.

BUG=b:165187866
TEST=emerge-asurada depthcharge
BRANCH=none

Cq-Depend: chromium:2522156
Change-Id: I652d6261ed559a948e7bd578da3ec81d54374039
Signed-off-by: Yu-Ping Wu <yupingso@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/vboot_reference/+/2522416
Reviewed-by: Hsuan Ting Chen <roccochen@chromium.org>
Reviewed-by: Joel Kitching <kitching@chromium.org>
4 files changed