[Task]: Integrate families rockpis and rock-s0 into the rockchip64 family

[ColorfulRhino]

Task description

Both of these families are only for one specific board and can be easily integreated into rockchip64 as discussed in #6879 (comment) and also in the forums.

• Move all stuff that is specific to the board into the board's config (no board conditionals in family config)
• Move everything not board-specific into rockchip64 config
• Integrate kernel patches into rockchip64 where applicable
• Remove kernel configs

Assigning to @brentr as discussed in #6821 (comment)
Please note that this won't be done before september:

I will "move stuff" out of the RockPI-S family in September, after I can test again

If anyone else wants to take up the task though, feel free to do so and discuss with @brentr .

[github-actions]

Jira ticket: AR-2409

[brentr]

Sorry for the long hiatus. I'm starting to look at this issue now.
I'll likely have questions in the coming days.