media: dvb: Extend API for secure settings

Some applications require setting of multiple cipher
operations for a specific PID for either decryption
and/or encryption. In addition, applications may
need to play content from secured buffer after decryption
was performed on the original content.

Change-Id: Iaf0b7c0684d7b95156363b203f4e89b48eae8711
Signed-off-by: Hamad Kadmany <hkadmany@codeaurora.org>