Stop dynamically depending on legacy-android-test

The legacy-android-test target is deprecated.

The following change descriptions were generated automatically and so
may be a little repetitive. They are provided to give the reviewer
enough information to check the comments match what has actually been
changed and check the reasoning behind the changes.

* libraries/aupt-lib/Android.mk
    Removed legacy-android-test from LOCAL_JAVA_LIBRARIES because
    legacy-android-test is deprecated and AuptLib source does not
    depend on it or its classes.

Bug: 30188076
Test: make checkbuild
Change-Id: I96f78e04bc67c00a4ec33c0445491b94b9aceb5e