Add android.test.base/stubs dependency

In preparation for the removal of the non-junit classes in the
android.test.base library from the android.jar this adds a dependency
on android.test.base/stubs to ensure this code will continue to
compile.

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.

* cmds/uiautomator/instrumentation/Android.mk
    Added 'android.test.base.stubs' to LOCAL_JAVA_LIBRARIES because
    uiautomator-instrumentation's will need them in order to compile
    once its classes are removed from the current SDK on which it
    currently depends.

* core/tests/hosttests/test-apps/ExternalSharedPerms/Android.mk
    Added 'android.test.base.stubs' to LOCAL_JAVA_LIBRARIES because
    ExternalSharedPermsTestApp's will need them in order to compile
    once its classes are removed from the current SDK on which it
    currently depends.

* core/tests/hosttests/test-apps/ExternalSharedPermsBT/Android.mk
    Added 'android.test.base.stubs' to LOCAL_JAVA_LIBRARIES because
    ExternalSharedPermsBTTestApp's will need them in order to compile
    once its classes are removed from the current SDK on which it
    currently depends.

* core/tests/hosttests/test-apps/ExternalSharedPermsDiffKey/Android.mk
    Added 'android.test.base.stubs' to LOCAL_JAVA_LIBRARIES because
    ExternalSharedPermsDiffKeyTestApp's will need them in order to
    compile once its classes are removed from the current SDK on which
    it currently depends.

* core/tests/hosttests/test-apps/ExternalSharedPermsFL/Android.mk
    Added 'android.test.base.stubs' to LOCAL_JAVA_LIBRARIES because
    ExternalSharedPermsFLTestApp's will need them in order to compile
    once its classes are removed from the current SDK on which it
    currently depends.

* nfc-extras/tests/Android.mk
    Added 'android.test.base.stubs' to LOCAL_JAVA_LIBRARIES because
    NfcExtrasTests's will need them in order to compile once its
    classes are removed from the current SDK on which it currently
    depends.

* tests/SurfaceComposition/Android.mk
    Added 'android.test.base.stubs' to LOCAL_JAVA_LIBRARIES because
    SurfaceComposition's will need them in order to compile once its
    classes are removed from the current SDK on which it currently
    depends.

* tests/WindowAnimationJank/Android.mk
    Added 'android.test.base.stubs' to LOCAL_JAVA_LIBRARIES because
    WindowAnimationJank's will need them in order to compile once its
    classes are removed from the current SDK on which it currently
    depends.

Bug: 30188076
Test: make dist
Change-Id: I92b3ff3e5fede3d8d8ecefb0b2e1ee93c5ca9875