msm: vidc: Free meta buffers during address table cleanup

This change frees the allocated meta buffers, if any
present, during video core address table cleanup.

Change-Id: Id8c42491040bc5be09f3bb59780d376e6921c76e
CRs-fixed: 459980
Signed-off-by: Deepak Verma <dverma@codeaurora.org>