msm: vidc: Enable support for slave side CP

Add the required alignment for secure video session
to acheive content protection at slave side.
Also assign the heap mask id to allocate the video
buffers as per the legacy SMMU driver.

Change-Id: I881713e22121d27364fedd0bd2c4cd95a827c114
Signed-off-by: Vikash Garodia <vgarodia@codeaurora.org>