[media] ml86v7667: override default field interlace order

ML86V7667 always transmits top field first for both PAL and  NTSC -- that makes
application incorrectly  treat interlaced  fields when relying on the standard.
Hence we must set V4L2_FIELD_INTERLACED_TB format explicitly.

[Sergei: added a comment.]

Reported-by: Katsuya MATSUBARA <matsu@igel.co.jp>
Signed-off-by: Vladimir Barinov <vladimir.barinov@cogentembedded.com>
Signed-off-by: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
Tested-by: Katsuya MATSUBARA <matsu@igel.co.jp>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>