scripts/gdb: add get_gdbserver_type helper

        if target_arch is None:

            target_arch = gdb.execute("show architecture", to_string=True)

        return arch in target_arch

GDBSERVER_QEMU = 0

GDBSERVER_KGDB = 1

gdbserver_type = None

def get_gdbserver_type():

    def exit_handler(event):

        global gdbserver_type

        gdbserver_type = None

        gdb.events.exited.disconnect(exit_handler)

    def probe_qemu():

        try:

            return gdb.execute("monitor info version", to_string=True) != ""

        except:

            return False

    def probe_kgdb():

        try:

            thread_info = gdb.execute("info thread 2", to_string=True)

            return "shadowCPU0" in thread_info

        except:

            return False

    global gdbserver_type

    if gdbserver_type is None:

        if probe_qemu():

            gdbserver_type = GDBSERVER_QEMU

        elif probe_kgdb():

            gdbserver_type = GDBSERVER_KGDB

        if not gdbserver_type is None and hasattr(gdb, 'events'):

            gdb.events.exited.connect(exit_handler)

    return gdbserver_type