ui: Rename vb2ex_beep() to ui_beep()

Since the UI code now lives in depthcharge, vb2ex_beep() is no longer
needed to be in vboot API. Therefore, rename it to ui_beep() and move
the implementation to ui/beep.c.

BUG=b:172339016
TEST=make unit-tests -j
TEST=make test-screenshot
TEST=emerge-corsola depthcharge
BRANCH=none

Change-Id: I783be781b510cbf610b74d50fdfaa1b9e20a0917
Signed-off-by: Yu-Ping Wu <yupingso@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/depthcharge/+/3631405
Reviewed-by: Hsuan Ting Chen <roccochen@chromium.org>
14 files changed