Enabled a11y for clock carousel view

This CL adds changes in order to announce correct a11y label when the
clock carousel view is in focus by the user in a11y mode.

Bug: b/278649728
Test: Tested by building wallpaper picker on local, turning on talkback
and checking if the announcement for clock carousel is made and custom
actions are available or not
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:5898ba8b69628d56518da733de19c10ecb86f46c)
Merged-In: Ibaaee3ac11f46f066e8ba531f414cb5201ad55e9
Change-Id: Ibaaee3ac11f46f066e8ba531f414cb5201ad55e9