Support multiple ROMs #1049

Job	Run time
riscv-arch-test	0s
riscv-tests (DefaultConfig)	20m 7s
emulator (DefaultSmallConfig)	13m 21s
riscv-tests (DefaultBufferlessConfig)	19m 39s
jtag-dtm-test (freechips.rocketchip.system.WithJtagDTMSystem_freechips.rocketchip.system.DefaultC...	21m 44s
emulator (DualBankConfig)	14m 6s
riscv-tests (DefaultRV32Config)	18m 30s
jtag-dtm-test (freechips.rocketchip.system.WithJtagDTMSystem_freechips.rocketchip.system.DefaultR...	20m 0s
emulator (DualChannelConfig)	13m 59s
riscv-tests (TinyConfig)	13m 52s
jtag-dtm-test (freechips.rocketchip.system.WithJtagDTMSystem_freechips.rocketchip.system.WithDebu...	18m 21s
riscv-tests (DefaultFP16Config)	14m 46s
emulator (DualChannelDualBankConfig)	14m 1s
jtag-dtm-test (freechips.rocketchip.system.WithJtagDTMSystem_freechips.rocketchip.system.WithDebu...	18m 7s
riscv-tests (DefaultBConfig)	13m 54s
emulator (RoccExampleConfig)	13m 32s
riscv-tests (DefaultRV32BConfig)	13m 53s
emulator (Edge128BitConfig)	13m 22s
emulator (Edge32BitConfig)	13m 25s
emulator (QuadChannelBenchmarkConfig)	13m 55s
emulator (EightChannelConfig)	14m 6s
emulator (DualCoreConfig)	13m 37s
emulator (MemPortOnlyConfig)	15m 18s
emulator (MMIOPortOnlyConfig)	13m 8s
emulator (CloneTileConfig)	14m 45s
emulator (HypervisorConfig)	13m 29s
	6h 26m 57s

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