uefi: Add special broadcast nvme namespace

[seijikun]

Checklist

• Sensible git history (for example, squash "typo" or "fix" commits). See the Rewriting History guide for help.
• Update the changelog (if necessary)

[phip1611]

LGTM! Can you please briefly describe in what scenarios this is used by you?

[seijikun]

If I understood it correctly, this is basically the same as the special 0x00 (controller) address but from an older NVMe spec. I saw it in the smartmontools repo. Apparently, for some commands (like GET LOG PAGE == SMART), you are supposed to try both, to also be compatible with older NVMes.
It has a lot of mentions in the NVME spec, so I think it's a good idea to have it.