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This splits out the kiosk related mojos from the login controller
interface, and removes kiosk_app_info.mojom. It also removes a couple
methods from mojom::LoginScreenClient, replacing them with a single
callback passed to the KioskAppMenu.

TBR=tsepez@chromium.org

Bug: 958206, 958204
Change-Id: I59d38c83fc91397d1d0890c87f5b18fe23fac7d8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1604333Reviewed-by: Evan Stade <estade@chromium.org>
Reviewed-by: Tom Sepez <tsepez@chromium.org>
Reviewed-by: James Cook <jamescook@chromium.org>
Commit-Queue: Evan Stade <estade@chromium.org>
Cr-Commit-Position: refs/heads/master@{#659100}