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: I8773103c5752477df8edb6bc376dad5ed45f7960
Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
diff --git a/.clang-tidy b/.clang-tidy
index b14abca..459c9d5 100644
--- a/.clang-tidy
+++ b/.clang-tidy
@@ -1,23 +1,9 @@
-Checks: '
--*,
+Checks: '-*,
+    modernize-use-nullptr
+    '
 
-# Categories
--bugprone-*,
--cert-*,
--clang-analyzer-*,
--cppcoreguidelines-*,
--misc-*,
--modernize-*,
-modernize-use-nullptr,
--performance-*,
--readability-*,
-'
-
-# Treat all warnings as errors
-WarningsAsErrors: '*'
-
-# Apply checks to all files
-HeaderFilterRegex: '.*'
-
-# Disable automatic formatting
 FormatStyle: none
+
+HeaderFilterRegex: .*
+
+WarningsAsErrors: '*'