update .gitignore

hc

2024-03-26 e9199a72d842cbda78ac614eee5db7cdaa6f2530

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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