guest_os_booting: enable secure boot firmware feature on aarch64

[hholoubk]

Summary

• Extend guest_os_booting.ovmf_firmware_feature.positive_test.enable_secure_boot to aarch64
• On ARM, libvirt selects the uefi-vars firmware (QEMU_EFI.qemuvars.fd + vars.secboot.json varstore) instead of pflash OVMF
• Gate the aarch64 variant on libvirt 12.1+ and QEMU 10.2+, where uefi-vars secure boot support is available
• Add QEMU version check in ovmf_firmware_feature.py via is_qemu_function_supported()

Test plan

• Run on x86 q35: avocado run --vt-type libvirt guest_os_booting.ovmf_firmware_feature.positive_test.enable_secure_boot — should pass unchanged
• Run on aarch64 with libvirt >= 12.1 and QEMU >= 10.2: same test name — should define varstore/rom loader and boot successfully
• Run on aarch64 with older libvirt/QEMU — test should cancel with unsupported version message

Summary by CodeRabbit

Release Notes

• Tests
  • Enhanced AArch64 OVMF firmware testing with version-specific configuration and loader support.
  • Added QEMU capability validation to ensure supported functionality before test execution.

[coderabbitai]

Walkthrough

The enable_secure_boot test case previously excluded AArch64 (no aarch64). This PR replaces that exclusion with an AArch64-specific configuration block in ovmf_firmware_feature.cfg that adds libvirt and QEMU version gating, sets loader_path to the AArch64 QEMU EFI firmware, defines a varstore_template, and updates firmware_xpath to use AArch64-specific varstore template lookup and a rom loader type instead of pflash. In the test runner ovmf_firmware_feature.py, utils_misc is imported from virttest and utils_misc.is_qemu_function_supported(params) is called at the start of run() before guest preparation proceeds.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~5 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and specifically summarizes the main change: enabling secure boot firmware feature support on aarch64 architecture, which is the primary objective of this PR.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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