Increase video buffering target and enable it for clear content as well

The delay between video data request and write could be very
high. Causing video underflows and framedrops in some cases (ex. high
bitrate videos).

This change increases the buffering target for video to account for
such delays.

Change-Id: I443d049fff99e5d9bbb7c384e793aad72a2f01cf
Signed-off-by: Eugene Mutavchi <Ievgen_Mutavchi@comcast.com>