CI: switch to opensbi for linux-hello & switch to mfc for MC #2836
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We have discoverd that the older version of riscv-pk crashes on harts that support H-ext due to issues with checking mideleg. Although this issue was fixed back in 2021 (commit 4ae5a88), considering that riscv-pk has been replaced by opensbi, we deciede to gradually transition our testing workloads to utilize opensbi instead.
Using MFC for "EMU - MC" test may decrease the total ci time.
This PR might be the last part of migrating the Linux-hello test in CI from riscv-pk to OpenSBI.