eatt: Handle L2CAP collision on EATT

When Android is a Central and collision is detected, Android will
send another request to the remote device after local request is
completed.

If Android is a Peripheral, it will let Central to setup EATT, however
for PTS test case, it will handle collision assumint local CID limit
equal 5.
This can be enabled with
PTS_EattPeripheralCollionSupport=true

Bug: 236216322
Bug: 237746679
Test: atest BluetoothInstrumentationTests
Test: PTS
Tag: #stability
Change-Id: Iada26e11de5b1e2631389e280417a4616d3795cd