Remove unnecessary and unsupported metalava argument

Metalava used to accept and ignore any argument starting with `-J-`.
Previously, that was passed through to `javadoc` but `metalava` no
longer invokes `javadoc` so those arguments were simply ignored.
Change https://r.android.com/2617632 dropped support for those
ignored arguments and the associated change in this topic merges that
change (among others) into master.

Bug: 281035030
Test: m checkapi
      m out/bazel/output/execroot/__main__/bazel-out/k8-opt-ST-83568b577b37/bin/frameworks/base/api/current.txt
Change-Id: I5d7f44c17575f4a70fff31103619746d838dde62