msm: vidc: Compare ion_handles rather than fds

fd(s) cannot uniquely identify buffers queued by cross-process
clients. Use ion handles to compare and match already-mapped-
buffers irrespective of data or extradata planes.

CRs-Fixed: 1060416
Change-Id: I591f18aa225cc6690bf423f2ae5bc7dafd4dad78
Signed-off-by: Praveen Chavan <pchavan@codeaurora.org>