Implement MSHV aarch64 backend#1626
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Add a full VirtualMachine trait implementation for MSHV on aarch64, replacing the previous stub that returned false/unimplemented. Key changes: - mshv/aarch64.rs: Complete implementation including VM creation, memory mapping, vcpu run loop with MMIO-based I/O dispatch, general/FPU/special register access via hv_register_assoc, and vcpu reset support. - hyperlight_vm/aarch64.rs: Wire up MshvVm::new() so MSHV is used when detected (previously returned NoHypervisorFound). - memory_region.rs: Implement TryFrom<hv_arm64_memory_intercept_message> for MemoryRegionFlags using intercept_access_type field. The implementation mirrors the KVM aarch64 backend's I/O page pattern (MMIO writes to the I/O page GPA are interpreted as port I/O) and follows MSHV x86_64 patterns for partition creation and register access. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com> Signed-off-by: cshung <3410332+cshung@users.noreply.github.com>
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Summary
Implements the VirtualMachine trait for MSHV on aarch64, replacing the previous stub.
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