Guest self-hosted debug tests from Ricardo Koller
* kvm-arm64/selftest/debug:
KVM: selftests: Add aarch64/debug-exceptions test
KVM: selftests: Add exception handling support for aarch64
KVM: selftests: Move GUEST_ASSERT_EQ to utils header
KVM: selftests: Introduce UCALL_UNHANDLED for unhandled vector reporting
KVM: selftests: Complete x86_64/sync_regs_test ucall
KVM: selftests: Rename vm_handle_exception