Core2, SRAM2: provide safety gap (#2754)

* Core2, SRAM2: use ob, provide safety gap
* thread: comment about critical section and scheduler state

furi/core/thread.c

@@ -56,6 +56,8 @@ static int32_t __furi_thread_stdout_flush(FuriThread* thread);
 
 /** Catch threads that are trying to exit wrong way */
 __attribute__((__noreturn__)) void furi_thread_catch() { //-V1082
+    // If you're here it means you're probably doing something wrong
+    // with critical sections or with scheduler state
     asm volatile("nop"); // extra magic
     furi_crash("You are doing it wrong"); //-V779
     __builtin_unreachable();