Fix pairing state change in collision scenario

Fix pairing state change in collision scenario

Symptom:
DUT Stuck in pairing state forever with selfy stick
during repair.

Steps:
1. Pair and connect remote devices with DUT.
2. Now un pair selfy stick from DUT.
3. Keep remote in discoverable mode.
4. Start inquiry and try to pair with device.

Failure:
Pairing with selfy stick always fails after collision.

Root Cause:
As we return from btm_sec_dd_create_conn with out
moving pairing state in connection collision scenario. Pairing
state will remains idle and pairing won't proceed further.

Fix:
Move the pairing state in collision scenario so that pairing
can proceed further.

Change-Id: Ic5c446ad3902b0ce16c7223ec2d8e4a625831446