First try to purge out ClockGroup API #877

Job	Run time
riscv-arch-test	0s
jtag-dtm-test (freechips.rocketchip.system.WithJtagDTMSystem_freechips.rocketchip.system.DefaultC...	11m 49s
riscv-tests (DefaultConfig)	11m 49s
jtag-dtm-test (freechips.rocketchip.system.WithJtagDTMSystem_freechips.rocketchip.system.DefaultR...	11m 51s
emulator (DefaultSmallConfig)	12m 3s
riscv-tests (DefaultBufferlessConfig)	11m 45s
jtag-dtm-test (freechips.rocketchip.system.WithJtagDTMSystem_freechips.rocketchip.system.WithDebu...	11m 51s
emulator (DualBankConfig)	11m 54s
riscv-tests (DefaultRV32Config)	11m 42s
jtag-dtm-test (freechips.rocketchip.system.WithJtagDTMSystem_freechips.rocketchip.system.WithDebu...	11m 41s
emulator (DualChannelConfig)	11m 55s
riscv-tests (TinyConfig)	11m 51s
emulator (DualChannelDualBankConfig)	12m 3s
riscv-tests (DefaultFP16Config)	12m 0s
emulator (RoccExampleConfig)	11m 57s
emulator (Edge128BitConfig)	12m 5s
emulator (Edge32BitConfig)	12m 9s
emulator (QuadChannelBenchmarkConfig)	11m 56s
emulator (EightChannelConfig)	11m 52s
emulator (DualCoreConfig)	11m 51s
emulator (MemPortOnlyConfig)	11m 59s
emulator (MMIOPortOnlyConfig)	12m 7s
emulator (CloneTileConfig)	12m 13s
emulator (HypervisorConfig)	12m 3s
	4h 34m 26s

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