msm: vidc: Store interlace information in driver

When HW returns interlace information in event, store this in
instance struct. This is useful in debugging.

CRs-Fixed: 2119753
Change-Id: I8afbec604fb21ff0a157faa704f0450872b1fb92
Signed-off-by: Praneeth Paladugu <ppaladug@codeaurora.org>