SurfaceFlinger: fix PhaseOffsetsTest

The unit test itself should pass the offsets for test instead
of depending on the device config.

Test: adb shell /data/nativetest64/libsurfaceflinger_unittest/libsurfaceflinger_unittest
Bug: 155191846
Change-Id: Ie84c0f90a35f75ae1c879954b7a4f214bceefd6a
3 files changed