gatt: Disconnected device if there is out of resources issue

When remote devices connects but it turns out there is no resources to
handle another gatt connection, ACL should be dropped to avoid non
functional device to be connected

Bug: 325438660
Bug: 325929235
Test: mmm packages/modules/Bluetooth
Test: Manual decrease GATT_MAX_PHY_CHANNEL to 1 and verify connection 2
devices.

Change-Id: I823a56c60f033485df17756208fe12b8ca1ba790