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On device initialized before M74 (when boot lockbox was first
introduced), it requires a powerwash first to use boot lockbox. In such
case, disable the toggle and show sublabel to explain the situation.

      1) still see login screen warning indicator
      2) see settings toggle disabled, with a sublabel

Test: Force to return NEED_POWERWASH from session_manager
Test: No change if not forced
Bug: chromium:893332
Change-Id: Idf75884404769ff724be0225aa9a674e03d978ee
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1918335
Commit-Queue: Victor Hsieh <victorhsieh@chromium.org>
Reviewed-by: Toni Baržić <tbarzic@chromium.org>
Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#715877}