[doc,site] Add succinct 'human-name' field to all .hjson

### Description

In the initial [earlgrey-diagram](https://opentitan.org/documentation/index.html) PR (https://github.com/lowRISC/opentitan/pull/17405#discussion_r1132433916), it was noted that the diagram tooltips use custom names for each block, and it would be nice to pull this data from a single source of truth. The block level .hjson field 'human-name' would be ideal, but some blocks are currently missing this label, and some have labels which are too long to easily integrate into a tooltip.

Review the block-level .hjson files used by earlgrey-diagram, beginning with the initial earlgrey-diagram PR and its discussion. Ensure every block has a succinct human-name suitable for diagram tooltips; the work is done when all relevant .hjson files contain usable labels.

Written by the indexing model from the issue text.