This avoid lengthy/duplicate sniffing for drm plugins when a decrypt session is opened
o The change is backward compatibile in that no update is required
for existing drm plug-ins if they do not plan to provide separate
sniffer/extractor
related-to-bug: 5725548
Change-Id: I7fc4caf82d77472da4e2bc7b5d31060fb54fd84c
d1ba6ed945