Switch waveform generation to FST #1004

Job	Run time
riscv-arch-test	0s
riscv-tests (DefaultConfig)	20m 48s
emulator (DefaultSmallConfig)	14m 7s
riscv-tests (DefaultBufferlessConfig)	21m 8s
jtag-dtm-test (freechips.rocketchip.system.WithJtagDTMSystem_freechips.rocketchip.system.DefaultC...	23m 12s
emulator (DualBankConfig)	14m 47s
riscv-tests (DefaultRV32Config)	19m 44s
jtag-dtm-test (freechips.rocketchip.system.WithJtagDTMSystem_freechips.rocketchip.system.DefaultR...	21m 4s
emulator (DualChannelConfig)	14m 57s
riscv-tests (TinyConfig)	14m 17s
jtag-dtm-test (freechips.rocketchip.system.WithJtagDTMSystem_freechips.rocketchip.system.WithDebu...	19m 55s
emulator (DualChannelDualBankConfig)	15m 34s
riscv-tests (DefaultFP16Config)	15m 28s
jtag-dtm-test (freechips.rocketchip.system.WithJtagDTMSystem_freechips.rocketchip.system.WithDebu...	18m 51s
emulator (RoccExampleConfig)	14m 16s
emulator (Edge128BitConfig)	14m 53s
emulator (Edge32BitConfig)	14m 15s
emulator (QuadChannelBenchmarkConfig)	14m 52s
emulator (EightChannelConfig)	15m 40s
emulator (DualCoreConfig)	15m 3s
emulator (MemPortOnlyConfig)	13m 52s
emulator (MMIOPortOnlyConfig)	15m 50s
emulator (CloneTileConfig)	19m 3s
emulator (HypervisorConfig)	14m 7s
	6h 25m 43s

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