SDK / exoplayer

The previous name is quite easy to misread because it sounds like it
splits up like "(session) for (clear types)" when it's meant to be
"(session for clear) (types)".

The old field is left deprecated for backwards compatibility. The
DrmConfiguration.Builder methods are directly renamed without
deprecation because they're not yet present in a released version of
the library.

PiperOrigin-RevId: 403338799