scripts: west_commands: runners: nrfutil: use x-execute-batch

execute-batch is now named x-execute-batch, as it is an experimental
option.

Signed-off-by: Gerard Marull-Paretas <gerard@teslabs.com>
diff --git a/scripts/west_commands/runners/nrfutil.py b/scripts/west_commands/runners/nrfutil.py
index 719e432..50db41a 100644
--- a/scripts/west_commands/runners/nrfutil.py
+++ b/scripts/west_commands/runners/nrfutil.py
@@ -97,7 +97,7 @@
         self._ops = []
         self._op_id = 1
         self.logger.debug(f'Executing batch in: {json_file}')
-        self._exec(['execute-batch', '--batch-path', f'{json_file}',
+        self._exec(['x-execute-batch', '--batch-path', f'{json_file}',
                     '--serial-number', f'{self.dev_id}'])
 
     def do_exec_op(self, op, force=False):
diff --git a/scripts/west_commands/tests/test_nrf.py b/scripts/west_commands/tests/test_nrf.py
index 405e6ea..a15fe23 100644
--- a/scripts/west_commands/tests/test_nrf.py
+++ b/scripts/west_commands/tests/test_nrf.py
@@ -521,7 +521,7 @@
         # Extract filename
         nrfutil_args = check_fn.call_args_list[0].args[0]
         tmpfile = nrfutil_args[nrfutil_args.index('--batch-path') + 1]
-        cmds = (['nrfutil', '--json', 'device', 'execute-batch', '--batch-path',
+        cmds = (['nrfutil', '--json', 'device', 'x-execute-batch', '--batch-path',
                  tmpfile, '--serial-number', expected[0]],)
     else:
         cmds = expected