riscv-rt: Use _start_rust and hal_main
#324
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This PR goes back to using
_start_rust, reducing the assembly code to the minimum. Also, inspired byesp-riscv-rt, now_start_rustjumps tohal_maininstead ofmain. At linker level, ifhal_mainis not defined, it maps tomain, so it would still work in the same was as of today.