mcu/fe310: Update to stock compiler #3160
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Previously riscv64-unknown-elf toolchain from SiFive was used. Now there is commonly available version. Unfortunately it does not have required option icsr enabled. This adds -march=rv32imaczicsr to compiler while keeps -march=rv32imac for linker to be able to used default libraries.
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Previously riscv64-unknown-elf toolchain from SiFive was used. Now there is commonly available version.
Unfortunately it does not have required option icsr enabled.
This adds -march=rv32imaczicsr to compiler while keeps -march=rv32imac for linker to be able to used default libraries.