DashPlayer: Fix in DashCodec for Adapative Streaming

Fix in DashCodec for Adaptive Streaming

Change-Id: Ie1e30627c8095a7210ad4e16c96f5f79abff22c6
CRs-fixed: 596767
Merge remote-tracking branch 'cm/cm-11.0' into kk-4.4
mm-video: vdec: No need to allocate metadata by default

If metadata is not enabled by client, there is not need
to enable it by default in secure session.

Change-Id: I031aa193271492e46bddf14f53ee033d0d68e138