@IntDef is switching from long to int values

This cast will be necessary when the @IntDef annotation
values changes type from long to int, and the cast is
safe because the value is itself not used at all (this
is a source retention annotation, and the static analyzer
is using the field reference itself, not the value --
that's the whole point of this annotation.)

Test: The compiler
Change-Id: I88d2fd238c9b405a8140e06d5d8185596236ae38