Merge https://source.denx.de/u-boot/custodians/u-boot-riscv

CI: https://source.denx.de/u-boot/custodians/u-boot-riscv/-/pipelines/23051

- risc-v: Add Zicbom support
- board: Support RVVM board
- DTS: device tree fixes
- configs: Enable some configs