Switch exception bits by correspond extensions

[binno]

if zicfi extension is enabled, software check fault existed.
if zicntr extension is enabled, hardware error fault existed.

[aswaterman]

What bug is this fixing? I don't think Spike is doing anything wrong here.

[binno]

What bug is this fixing? I don't think Spike is doing anything wrong here.

I think this is not bug but more like the following operation:
If the Zca extension isn't enabled, misaligned fetch fault never happened
So the corresponding bit of medeleg is write ignored and mask out

bool medeleg_csr_t::unlogged_write(const reg_t val) noexcept {
  const reg_t mask = 0
    | (proc->extension_enabled(EXT_ZCA) ? 0 : 1 << CAUSE_MISALIGNED_FETCH)