Revert "clients: teach simple-dmabuf-v4l to deal with flipped input"

Revert "clients: teach simple-dmabuf-v4l to deal with flipped input"

This reverts commit 0fee977c46423e496a6eda6418c31bfe09a1f27b.

This commit introduces a requirement on v4l2_query_ext_ctrl and
VIDIOC_QUERY_EXT_CTRL, which were introduced in kernel 3.17. Some Ubuntu
LTS releases ship with much older kernels (and, significantly, UAPI),
which don't have these.

Signed-off-by: Daniel Stone <daniels@collabora.com>
Acked-by: Pekka Paalanen <pekka.paalanen@collabora.com>
Acked-by: Derek Foreman <derekf@osg.samsung.com>