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As the author confirmed as in: <https://lists.infradead.org/pipermail/linux-riscv/2025-May/070844.html>, runtime detection of the Zicntr extension (as in the Linux kernel 6.15) is currently (and technically) redundant on the current base IMA behavior (although can be meaningful if new base behavior is added). This commit implies the Zicntr extension from the base IMA behavior.