Revert "libstagefright: support for disabling buffer metadata"

This reverts commit 5ed9169689e4565e0db9837fad29a9149db59ee0.
Revert "try to fix build error"

This reverts commit 6ba29a514ea838ab9aa8e1046ccabbdd8043cd70.
Revert "WifiDisplay: Add an HDCP toggle"

This reverts commit b8eee23218c0eddd5bb6227148c1f954e78f67ff.