riscv-rt: copy hart ID to a0 in M-mode
#307
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Minor change that simplifies the assembly code.
At the beginning of the runtime, we assume that, in S-mode, the hart ID is provided by the previous bootload via
a0. This is not true in M-mode. This PR copiesmhartidtoa0at the beginning of runtime, allowing the rest of the code to be the same in both S-mode and M-mode.