mm-video-v4l2: vdec: allocate secure buffer as native_handle

Rather than stashing a file-descriptor directly in pBuffer,
wrap the fd in a native_handle to enable client to pass
fds safely to crypto process.

CRs-Fixed: 1006103

Bug: 26780972
Change-Id: Ica3beac395a0e63c1e0aeec061ec88bb9055a31f
4 files changed