SDP cleanup fix

When BT stack is turned off, modules should be cleaned up in reverse
order that they are initialized. Therefore, move SDP cleanup before
L2CAP cleanup.

Also, wipe content of control block, including connection control blocks
when SDP is disabled. If any request or timer fires after stack
shutdown, it would not find connection to act on.

Flag: exempt, obvious cleanup
Test: manual, turn bluetooth OFF while SDP is scheduled
Bug: 329431466
Change-Id: I81e6f382466625cc2e0b72b62d91b77f40402b5a