Support multiple ROMs #1095

Job	Run time
riscv-arch-test	0s
emulator (DefaultSmallConfig)	12m 42s
emulator (DualBankConfig)	13m 10s
riscv-tests (DefaultConfig)	19m 44s
emulator (DualChannelConfig)	12m 56s
jtag-dtm-test (freechips.rocketchip.system.WithJtagDTMSystem_freechips.rocketchip.system.DefaultC...	21m 7s
riscv-tests (DefaultBufferlessConfig)	19m 35s
emulator (DualChannelDualBankConfig)	13m 22s
riscv-tests (DefaultRV32Config)	18m 43s
jtag-dtm-test (freechips.rocketchip.system.WithJtagDTMSystem_freechips.rocketchip.system.DefaultR...	19m 47s
emulator (RoccExampleConfig)	13m 44s
jtag-dtm-test (freechips.rocketchip.system.WithJtagDTMSystem_freechips.rocketchip.system.WithDebu...	17m 28s
riscv-tests (TinyConfig)	13m 27s
jtag-dtm-test (freechips.rocketchip.system.WithJtagDTMSystem_freechips.rocketchip.system.WithDebu...	17m 4s
emulator (Edge128BitConfig)	13m 38s
riscv-tests (DefaultFP16Config)	13m 40s
riscv-tests (DefaultBConfig)	13m 19s
emulator (Edge32BitConfig)	13m 25s
emulator (QuadChannelBenchmarkConfig)	13m 35s
riscv-tests (DefaultRV32BConfig)	13m 10s
emulator (EightChannelConfig)	13m 25s
emulator (DualCoreConfig)	13m 11s
emulator (MemPortOnlyConfig)	12m 52s
emulator (MMIOPortOnlyConfig)	12m 59s
emulator (CloneTileConfig)	14m 14s
emulator (HypervisorConfig)	12m 47s
	6h 13m 4s

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