SDK / exoplayer

This ensures Kotlin usages of these IntDef annotations in the 'old'
position will continue to compile.

'Frequently used' is a subjective judgement. I have a parallel change
that marks all the other public IntDefs in the library as TYPE_USE
(those that I've judged to be 'rarely used' by apps).

A follow-up change will fix the positions of existing usages to be as if
they're only TYPE_USE.

#minor-release

PiperOrigin-RevId: 426427334