Revert "add a .clang-format file (#9154)" (#9172)

I thought git would be smart enough to understand all the whitespace changes but even with all the flags I know to make it ignore theses it still blows up if there are identical changes on both sides.

I have a solution but it require creating a new commit at the merge base for each conflicting PR and merging it into develop.

I don't think blowing up all PRs is worth for now, maybe if we can coordinate this for V3 let's say.

This reverts commit 0d11331d18.

src/concurrency/Lock.h

@@ -2,31 +2,33 @@
 
 #include "../freertosinc.h"
 
-namespace concurrency {
+namespace concurrency
+{
 
 /**
  * @brief Simple wrapper around FreeRTOS API for implementing a mutex lock
  */
-class Lock {
-public:
-  Lock();
+class Lock
+{
+  public:
+    Lock();
 
-  Lock(const Lock &) = delete;
-  Lock &operator=(const Lock &) = delete;
+    Lock(const Lock &) = delete;
+    Lock &operator=(const Lock &) = delete;
 
-  /// Locks the lock.
-  //
-  // Must not be called from an ISR.
-  void lock();
+    /// Locks the lock.
+    //
+    // Must not be called from an ISR.
+    void lock();
 
-  // Unlocks the lock.
-  //
-  // Must not be called from an ISR.
-  void unlock();
+    // Unlocks the lock.
+    //
+    // Must not be called from an ISR.
+    void unlock();
 
-private:
+  private:
 #ifdef HAS_FREE_RTOS
-  SemaphoreHandle_t handle;
+    SemaphoreHandle_t handle;
 #endif
 };