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This commit adapts the encryption migration screen on crOS for devices
with a small screen. It also improves the messages in the event of
insufficient space.

Tested locally

Bug: 1002097
Change-Id: I6afb449e8499047f029b8c0159df4c9cea72d3a0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1845218
Commit-Queue: Renato Silva <rrsilva@google.com>
Reviewed-by: Roman Sorokin [CET] <rsorokin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#705033}