msm: vidc: Remove tz-usage table

Buffer_type to tz_usage table is not needed anymore
as the video client does not need to call msm_ion_secure_buffer
and so does not need to know the tz usage.

Change-Id: I41c9b4ca229c970081afd7f72ab774a098a01902
Signed-off-by: Shalaj Jain <shalajj@codeaurora.org>