bluetooth autotest: Add a wait before reading setting in default_state_test

TEST=Run luetooth_AdapterSASanity.sa_default_state_test
BUG=b:148219965

Change-Id: I88fd2783efe17c228fc9d7cda1814d943a879c85
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/autotest/+/2017575
Tested-by: Shijin Abraham <shijinabraham@google.com>
Auto-Submit: Shijin Abraham <shijinabraham@google.com>
Reviewed-by: Daniel Winkler <danielwinkler@google.com>
Commit-Queue: Shijin Abraham <shijinabraham@google.com>
diff --git a/server/cros/bluetooth/bluetooth_default_state_test.py b/server/cros/bluetooth/bluetooth_default_state_test.py
index fe2b53a..49b03f8 100644
--- a/server/cros/bluetooth/bluetooth_default_state_test.py
+++ b/server/cros/bluetooth/bluetooth_default_state_test.py
@@ -227,6 +227,8 @@
 
             self.add_device(DEVICE_ADDRESS, ADDRESS_TYPE, 1)
 
+            # Wait for a few seconds before reading the settings
+            time.sleep(3)
             current_settings = self.read_info()[4]
             self._log_settings("After add device", current_settings)