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In N, only applications with permission to manage do-not-disturb
or notification settings are allowed to silence the ringer.

Requesting that permission is not straightforward, and may not be
the right solution, so for now, disable the ringer muting for video
recording.

Bug: 29591150
Change-Id: I630812c0e4ca813bf4fa123321d60a4be6c2fbf7