clangd: ignore bugprone-sizeof-expression

clang-tidy is complaining about this:

  Suspicious usage of 'sizeof(A*)'; pointer to aggregate

For each READ_ONCE() / WRITE_ONCE().

We don't control them, easier to silence them for the moment.

Signed-off-by: Matthieu Baerts (NGI0) <matttbe@kernel.org>

README.md

@@ -239,7 +239,8 @@ docker run -v "${PWD}:${PWD}:rw" -w "${PWD}" --rm -it \
 If you use [VSCode for Linux kernel development](https://github.com/FlorentRevest/linux-kernel-vscode)
 add-on, you can configure it to use this docker image: simply copy all files
 from the [`vscode`](/tree/main/vscode) directory in your `.vscode` dir from the
-kernel source (or use symbolic links).
+kernel source (or use symbolic links). `.clangd` needs to be placed at the root
+of the kernel source directory.
 
 Notes:
 - The VSCode add-on needs some modifications, see

vscode/.clangd

@@ -0,0 +1,3 @@
+Diagnostics:
+  ClangTidy:
+    Remove: bugprone-sizeof-expression