l2cap: Workaround for PTS issue

Android is sending L2CAP_CONFIGURATION_REQ just after connection, which
is fine by spec, however PTS does not catch it sometimes.
Adding 5 sec delay helps. Note that the BT specification allows max
120 sec configuration timeout.

There is issue reported to PTS and once this is fixed on their side,
this can be reverted.

Bug: 371948052
Flag: Exempt, test code befind define
Test: mmm packages/modules/Bluetooth
Test: manual PTS L2CAP/FOC/BV-05-C
Change-Id: Ia0af0ea7777668c41130573cd8fcd89fa2d311c7