Don't tidy/format files in subproject

This pattern and files are copied from bmcweb.

Signed-off-by: Ed Tanous <edtanous@google.com>
Change-Id: I84d1bb3386cdf7426b497a92137ec87345dc77cb
diff --git a/.gitignore b/.gitignore
index 2619269..e0886a4 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,6 +1,8 @@
 build*/
 subprojects/*
 !subprojects/*.wrap
+!subprojects/.clang-tidy
+!subprojects/.clang-format
 
 .vscode
 .idea/