mm-core: Add support for Smooth streaming for secure mode playback.

   - This change will add the extension index required for
   - Smooth Streaming for both secure and non secure mode video playback.

Change-Id: I351b5c68702fc2dd83d50801b9bee7f8744c31b6
CRs-Fixed: 451786

Conflicts:
	mm-core/inc/OMX_QCOMExtns.h