(2/3) drop screen record service, make use of Screencast

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Revert "screenrecord: Enable SUBMIX_IN as well and cleanup on exit"

This reverts commit f0a3b502e7727607642a860070e21ff211be5fdd.

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Revert "screenrecord: Add audio support"

This reverts commit e036fbb60144f7a09c7ef1dd4df70f39439d9a84.

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Change-Id: Ibc33642dda4b8341615d6ca84192b5784452d552