fix: correct namespace for CpuFeature::amx_bf16 in env_detect_precision.cpp

sed substitution previously broke daal::CpuFeature::amx_bf16 → daal::amx_bf16.
amx_bf16 is a member of enum daal::CpuFeature, not daal namespace directly.

Signed-off-by: Nikolay Petrov <nikolay.a.petrov@intel.com>

Author: napetrov

cpp/daal/src/services/compiler/generic/env_detect_precision.cpp

@@ -49,7 +49,7 @@ namespace
 /// True iff AMX-BF16 is present and OS-enabled (CPUID + XCR0 check via
 /// daal_serv_cpu_feature_detect(), which is also cached internally).
 static const bool g_hw_amx_bf16 =
-    (daal_serv_cpu_feature_detect() & daal::amx_bf16) != 0;
+    (daal_serv_cpu_feature_detect() & daal::CpuFeature::amx_bf16) != 0;
 
 /// Parse ONEDAL_FLOAT32_MATMUL_PRECISION env var.
 /// Recognised values: "ALLOW_BF16" / "allow_bf16".  Everything else → strict.