DO NOT MERGE: Move AM/WM unit tests out of FrameworksServicesTests to WmTests

Test: All presubmit and non-flaky tests pass
    129 com.android.server.am
    176 com.android.server.wm
     32 com.android.server.policy
    $ tradefed.sh run commandAndExit WmTests \
        --include-filter com.android.server.am. \
        --include-annotation android.platform.test.annotations.Presubmit \
        --exclude-annotation android.support.test.filters.FlakyTest
    $ tradefed.sh run commandAndExit WmTests \
        --include-filter com.android.server.wm. \
        --include-annotation android.platform.test.annotations.Presubmit \
        --exclude-annotation android.support.test.filters.FlakyTest
    $ tradefed.sh run commandAndExit WmTests \
        --include-filter com.android.server.policy. \
        --include-annotation android.platform.test.annotations.Presubmit \
        --exclude-annotation android.support.test.filters.FlakyTest
Test: No AM/WM unit test in FrameworksServicesTests
    $ tradefed.sh run commandAndExit FrameworksServicesTests \
        --include-filter com.android.server.am.
    $ tradefed.sh run commandAndExit FrameworksServicesTests \
        --include-filter com.android.server.wm.
    $ tradefed.sh run commandAndExit FrameworksServicesTests \
        --include-filter com.android.server.policy.
Bug: 113800711

Change-Id: I01ab256aabf7e1f1b513fe3b92140f6936c2d649