msm: vidc: Recompute extradata address of buffers with ref 2

Recompute extradata virtual address for ftbs with ref count
2. This ftb can come on a different buffer index and hence
the corresponding extadata virtual address may not be valid.

CRs-Fixed: 2059493
Change-Id: I3f9d66b54436f14c0887f4b3df1d0d1bdae01459
Signed-off-by: Abdulla Anam <abdullahanam@codeaurora.org>