clang-tidy: format with config-clang-tidy

Reformat the .clang-tidy file for consistency using the
config-clang-tidy tool from openbmc-build-scripts.

Change-Id: I2a292438a8ea2e71476284fa21e67ae238bd7e15
Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
diff --git a/.clang-tidy b/.clang-tidy
index 4b6eca0..85e0e50 100644
--- a/.clang-tidy
+++ b/.clang-tidy
@@ -1,7 +1,8 @@
-Checks: '
-    -*,
+Checks: '-*,
     bugprone-unchecked-optional-access,
     readability-identifier-naming
-'
+    '
+
+HeaderFilterRegex: (?!^subprojects).*
+
 WarningsAsErrors: '*'
-HeaderFilterRegex: '(?!^subprojects).*'