video: add V4L2 cropping, control menu and overlay symbols

Adds missing structs symbols for V4L2.

video(4) capture devices do not crop, expose menu controls or support
overlay, and return ENOTTY for the new ioctls.
Applications enumerate these unconditionally and degrade gracefully
at run time, but fail to build when the declarations are missing.

Reviewed by: adrian
Differential Revision: https://reviews.freebsd.org/D59203