adding the VM-Exit method for Arm64

 On amd64, it uses 'HLT' to leave the guest.
 Unlike amd64, arm64 can only uses mmio_exit/psci to leave the guest.

 So, I designed the HYPERCALL_VMEXIT to be compatible with amd64/arm64.

 To keep it simple, I used the address of exception table as the
 MMIO base address, so that I can trigger a MMIO-EXIT by forcibly writing this space.
 Then, in host user space, I can calculate this address to find out
 which hypercall.

Signed-off-by: Bin Lu <bin.lu@arm.com>

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