build: enabled header diagnostics in clang-tidy

.clang-tidy

@@ -1,3 +1,7 @@
+HeaderFilterRegex: '/(examples|include|src|tests)/.*\.hpp'
+
+FormatStyle: file
+
 Checks: >
     -*,
     readability-identifier-naming,

cmake/platform.cmake

@@ -349,7 +349,8 @@ elseif(UNIX OR MINGW)
                     set(CMAKE_CXX_CLANG_TIDY ${CLANG_TIDY})
                     message(STATUS "Using clang-tidy to run checks")
                 elseif(DNNL_USE_CLANG_TIDY STREQUAL "FIX")
-                    set(CMAKE_CXX_CLANG_TIDY ${CLANG_TIDY} -fix)
+                    set(CMAKE_CXX_CLANG_TIDY ${CLANG_TIDY}
+                        -fix)
                     message(STATUS "Using clang-tidy to run checks and fix found issues")
                 endif()
             endif()

src/gpu/intel/jit/gemm/.clang-tidy

@@ -0,0 +1,3 @@
+Checks: '-*,misc-definitions-in-headers'
+CheckOptions:
+  - { key: HeaderFileExtensions,          value: "x" }

src/gpu/intel/microkernels/.clang-tidy

@@ -0,0 +1,3 @@
+Checks: '-*,misc-definitions-in-headers'
+CheckOptions:
+  - { key: HeaderFileExtensions,          value: "x" }