SurfaceFlinger: fix app duration by reducing 16.6ms

App durations are programmed incorrectly with an additional 16.6ms
to the value. This change doesn't have a real impact since the durations
are translated to the same offsets in SurfaceFlinger.

Test: adb shell /data/nativetest64/libsurfaceflinger_unittest/libsurfaceflinger_unittest
Bug: 153381686
Change-Id: Ic433bfef4dfc53130e51e50975e527466e159d22