media: vivid: Convert to v4l2_ext_pix_format

Simplify Multi/Single planer API handling by converting to v4l2_ext_pix_format.

Duplicate v4l2_ioctl_ops for touch devices. This is done to force the
framework to use the ext hooks when the classic Api is used from
userspace in Vid devices, and to keep touch devices with classic hook.

Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com>
Signed-off-by: Helen Koike <helen.koike@collabora.com>
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Changes in v6:
- Update with new format and buffer structs
- duplicate v4l2_ioctl_ops for touch devices.

Changes in v4:
- Update with new format and buffer structs
- Rebased on top of media/master (post 5.8-rc1)

Changes in v3:
- Rebased on top of media/master (post 5.4-rc1)

Changes in v2:
- New patch
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