Use .clang-tidy and remove madvise DO_FORK/DONT_FORK calls

This commit causes Android Studio to use the .clang-tidy file for configuration and removes madvise DO_FORK/DONT_FORK calls as they cause problems on many devices and are mostly unnecessary.

app/src/main/cpp/skyline/os.h

@@ -49,11 +49,5 @@ namespace skyline::kernel {
          * @param pid The PID of the thread
          */
         void KillThread(pid_t pid);
-
-        /**
-         * @brief Handles a particular SuperVisor Call
-         * @param svc The ID of the SVC to be called
-         */
-        void SvcHandler(const u16 svc);
     };
 }