media: video: Force drop 2nd field after VC drops 1st field

If a field was dropped by the VC, the VP would not be able to
de-interlace the content properly. The problem with the VP is
it would have an unbalanced number of top fields and bottom
fields. In order to alleviate this problem the subsequent field
will also be dropped. That way there would be a balanced number
of top and bottom fields in the VP which would prevent jumping
behavior observed in the de-interlaced frame.

Change-Id: I96e8c0670b5b29baea8d1574b21c259c16a7a32e
Signed-off-by: Terence Hampson <thampson@codeaurora.org>