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Add two new MMC test devices: - mmc13: LUKS2 encrypted with TKey-derived key, for testing TKey-based disk encryption unlock - mmc14: LUKS2 encrypted with a known master key, for testing the pre-derived master key unlock path The test setup generates keys matching the TKey emulator's deterministic output. An override.bin file can be used to test with a physical TKey. Co-developed-by: Claude <noreply@anthropic.com> Signed-off-by: Simon Glass <simon.glass@canonical.com>