uefi: Add bindings for the HII_CONFIG_ROUTING protocol

[seijikun]

I still had this lying around as experiment.
Polished it up a bit for the merge request.

It's best to review this commit-by-commit.

Checklist

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

[phip1611]

I reviewed everything and it LGTM! Thanks for working on this :) Left a few nits. Please answer my comments and then we are good to go

[phip1611]

please rebase, then I think we should be good to go :)

[phip1611]

Will do a final review tomorrow

[phip1611]

Could you please move the additions to aligned_buffer.rs (9b5cb8c) to a dedicated PR?

[phip1611]

LGTM, will merge once the pre-requisite in aligned_buffer.rs is moved into a dedicated PR.

[phip1611]

almost, almost there 🤏

[phip1611]

out of curiosity: What does this {} syntax refer to?

[seijikun]

I somehow wanted to illustrate that "DescHdr" is the name of an entity, declared in the UEFI spec.
The real name is <DescHdr>, but the CI didn't let me write that :(

https://uefi.org/sites/default/files/resources/UEFI_Spec_Final_2.11.pdf
Page 1803

• 35.2.1.1 Basic forms
• 35.2.1.2 Types
• 35.2.1.3 Routing elements