add xenomai

hc

2024-11-01 2f529f9b558ca1c1bd74be7437a84e4711743404

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[submodule "Silicon/RISC-V/ProcessorPkg/Library/RiscVOpensbiLib/opensbi"] 
  path = Silicon/RISC-V/ProcessorPkg/Library/RiscVOpensbiLib/opensbi 
  url = https://github.com/riscv/opensbi