[CPU][ARM] Fix CI: include order in kleidiai_mm, guard include in arm_isa_support.cpp

- kleidiai_mm.cpp: move "utils/arm_isa_support.h" to its sorted position among the
  utils/* includes (clang-format).
- arm_isa_support.cpp: include "arm_isa_support.h" inside the OPENVINO_ARCH_ARM* block.
  On non-ARM (x86_64 / RISC-V) the whole TU is empty, so an unconditional include was
  flagged unused by clang-tidy misc-include-cleaner.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: allnes

src/plugins/intel_cpu/src/nodes/executors/kleidiai/kleidiai_mm.cpp

@@ -35,10 +35,10 @@
 #include "openvino/core/except.hpp"
 #include "openvino/core/parallel.hpp"
 #include "openvino/core/type/element_type.hpp"
+#include "utils/arm_isa_support.h"
 #include "utils/cpu_utils.hpp"
 #include "utils/debug_capabilities.h"
 #include "utils/general_utils.h"
-#include "utils/arm_isa_support.h"
 
 #define FLOAT_MAX 3.4028235e38f
 #define FLOAT_MIN (-3.4028235e38f)

src/plugins/intel_cpu/src/utils/arm_isa_support.cpp

@@ -2,9 +2,9 @@
 // SPDX-License-Identifier: Apache-2.0
 //
 
-#include "arm_isa_support.h"
-
 #if defined(OPENVINO_ARCH_ARM) || defined(OPENVINO_ARCH_ARM64)
+#    include "arm_isa_support.h"
+
 #    include "openvino/core/except.hpp"
 #    include "openvino/runtime/system_conf.hpp"