media: broadcast: Remove AV timer references from TSPP driver

LPASS subsystem removing kernel interface to read AVTimer time stamps.
So remove kernel AV timer reference APIs from TSPP driver.

Change-Id: I6ffa4b100840fa5f0e195391a2fe347125872b16
Signed-off-by: Udaya Bhaskara Reddy Mallavarapu <udaym@codeaurora.org>