Add qemu_aarch64 column in the final correctness.csv file

[muhmuz]

Right now we are comparing all the targets with qemu arm, and there is no column of this target in the final correctness.csv file. Do add the column for qemu_aarch64 target in final correctness.csv file.

[muhmuz]

@mmhus Currently, we are comparing all other targets with qemu-aarch64, which is why I haven't included it in correctness_results.csv. However, if we want to include qemu-aarch64 in the correctness comparison, which target should we compare it with?