Fix AXI4 Xbar elaboration error due to missing fields #841

Job	Run time
riscv-arch-test	0s
emulator (DefaultSmallConfig)	13m 10s
riscv-tests (DefaultConfig)	19m 18s
emulator (DualBankConfig)	13m 47s
jtag-dtm-test (freechips.rocketchip.system.WithJtagDTMSystem_freechips.rocketchip.system.DefaultC...	21m 46s
riscv-tests (DefaultBufferlessConfig)	19m 20s
emulator (DualChannelConfig)	13m 25s
jtag-dtm-test (freechips.rocketchip.system.WithJtagDTMSystem_freechips.rocketchip.system.DefaultR...	21m 27s
riscv-tests (DefaultRV32Config)	19m 29s
emulator (DualChannelDualBankConfig)	13m 46s
jtag-dtm-test (freechips.rocketchip.system.WithJtagDTMSystem_freechips.rocketchip.system.WithDebu...	18m 18s
riscv-tests (TinyConfig)	13m 31s
emulator (RoccExampleConfig)	13m 9s
jtag-dtm-test (freechips.rocketchip.system.WithJtagDTMSystem_freechips.rocketchip.system.WithDebu...	17m 20s
riscv-tests (DefaultFP16Config)	14m 7s
emulator (Edge128BitConfig)	12m 59s
emulator (Edge32BitConfig)	13m 24s
emulator (QuadChannelBenchmarkConfig)	13m 15s
emulator (EightChannelConfig)	13m 49s
emulator (DualCoreConfig)	13m 40s
emulator (MemPortOnlyConfig)	13m 2s
emulator (MMIOPortOnlyConfig)	13m 1s
emulator (CloneTileConfig)	15m 39s
emulator (HypervisorConfig)	13m 1s
	5h 53m 43s

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