vidc: Add required variables in platform data for content protection

Add, initialize variables for firmware addr & secure write back
buffers in vidc platform data.

Change-Id: Ibb1e464af2e0e9038c8d43d6756d5a8481c7f618
Signed-off-by: Riaz Ur Rahaman <riazr@codeaurora.org>
6 files changed