We don't have any CDROM tests yet.
So, add some for the PCI/BMDMA HBA.

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For convenience, this branch is available at:
https://github.com/jnsnow/qemu.git branch ide-atapi-test
https://github.com/jnsnow/qemu/tree/ide-atapi-test

This version is tagged ide-atapi-test-v1:
https://github.com/jnsnow/qemu/releases/tag/ide-atapi-test-v1