Bluetooth: GAP: Cancel the previous visibilty alarms if already set

Cancel the previous visibility alarms set for 2 mins/5 mins/
1 hour if visibility change happens from the limited discoverable
to unlimited discoverable.

Change-Id: I01797b771c271498372f15b545233a73baf60ca9
CRs-fixed: 582492
Bluetooth: GAP: Cancel the pairing notification on bond state change

Cancel the pairing notification on bond state change happens from
BOND_BONDING to BOND_NONE.  Otherwise it will present in the
notification area until it gets cancelled by opening it and press
cancel on pairing dialog.

Change-Id: I96f673e29e612cd748165a1323a5b4a4276a843c
CRs-Fixed: 569534