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Add an additional pref to indicate whether the device in question
has the privacy sandbox settings UI available.

Modify the 2 existing prefs to be syncing.

Create an OWNERS file for chrome/browser/privacy_sandbox, and add some
members of the chrome friendly settings team to it.

Bug: 1152336
Change-Id: Ie39a763a703fc2c2ee092d14513fca31784037ea
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2565572Reviewed-by: Vasilii Sukhanov <vasilii@chromium.org>
Reviewed-by: Martin Šrámek <msramek@chromium.org>
Commit-Queue: Sean Harrison <harrisonsean@chromium.org>
Cr-Commit-Position: refs/heads/master@{#832294}