Remove individual Power HAL benchmarks

Keep single benchmark for the native library class
PowerHalController, which handles transaction errors and is
less flaky compared to direct HAL binder transactions.

Move PowerHalAidlBenchmarks tests to
PowerHalControllerBenchmarks, to cover missing APIs.

Fix: 409529485
Test: libpowermanager_benchmarks
Flag: EXEMPT test only
Change-Id: Ibb4e3be7cbe106acb58533ffbeb42b27b0d38319