gdbserver: remove current_thread_ptid

This function doesn't seem so useful.  Use `thread_info::id` directly.

Change-Id: I4ae4e7baa44e09704631a1c3a5a66e5b8b5a3594
Reviewed-By: Tankut Baris Aktemur <tankut.baris.aktemur@intel.com>
1 file changed