frameworks/av: Fix video recording breaks

Change Id0af9c8aed1a983095275ac03f7f59abc31594cc
using boot time for video recording start time
as default, but it is specific on devices using
qcom camera HAL3 and it breaks all devices
using camera HAL1.

Fix by changing the default behaviour when
property media.camera.ts.monotonic is not set.

And newer devices such as 8996 might need to setprop
media.camera.ts.monotonic 0 in order to work
properly when using camera HAL3.

Change-Id: Iee07ed1147713a6397fff43e3bbd4f4ed08b56b7