CVE-2025-39802 lib/crypto: arm/poly1305: Fix register corruption in no-SIMD contexts

In the Linux kernel, the following vulnerability has been resolved: lib/crypto: arm/poly1305: Fix register corruption in no-SIMD contexts Restore the SIMD usability check that was removed by commit 773426f4771b "crypto: arm/poly1305 - Add block-only interface". This safety check is cheap and is...