saa711x_set_v4lstd would toggle several bits that should not be touched
when changing std. This patch fixes this.
Signed-off-by: NJon Arne Jørgensen <jonarne@jonarne.no>
Signed-off-by: NHans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: NMauro Carvalho Chehab <m.chehab@samsung.com>