Revert "CI: cross-compile: riscv: Add RV64 machine with Zb* and Zk*"

Revert "CI: cross-compile: riscv: Add RV64 machine with Zb* and Zk*"

This reverts commit e787c57c538d0922004e49a10be0d403af773272.

The current CI host system is Ubuntu 22.04, which ships with QEMU 6.2.
This QEMU release is too old for the required RISC-V extensions.
We would need at least QEMU 7.1 (Aug 2022) for this patch.

Let's revert the patch.

Signed-off-by: Christoph Müllner <christoph.muellner@vrull.eu>
Reviewed-by: Matt Caswell <matt@openssl.org>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/20139)