[Pod] Update systemui_core benchmark to modify CentralSurfacesImpl. As part of the pods project, we're going to move the SystemUIApplicationImpl class out of the SystemUI-core build target. So, we need to update the systemui_core_add_log_call_benchmark to modify a class that will still be in the SystemUI-core build target even after SystemUIApplicationImpl is moved. Checking locally, this benchmark returned virtually the same number when modifying SystemUIApplicationImpl vs CentralSurfacesImpl (4m40s vs 4m39s), so I think this metric will be stable even with this change. Bug: 307607958 Test: `build/make/tools/perf/benchmarks --benchmark systemui_core_add_log_call` -> runs benchmark, returns approximately same value as before Change-Id: I69e0850d64e13d39a0bf46d51b802d69d59d7feb
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