Description of issue: When notifications are send from the peripheral to the central, the central is not receiving any ATT_HANDLE_VALUE_NOTI event from the stack at the GATT_EventHandler (inside app_data.c). This works fine before bond erasing. After erasing the bond, notifications will not properly work, even after boards are reset.

Configuration (only modifications done to the out-of-box example):

1. Peripheral (basic_ble): Bond Manager - Paring mode: wait for paring request.
2. Central (basic_ble_GATT_client ): Bond Manager - Paring mode: initiate a paring request.
3. Central (basic_ble_GATT_client ): app_menu.c include //Erase Bond information GAPBondMgr_SetParameter(GAPBOND_ERASE_ALLBONDS, 0, NULL); inside Menu_disconnectCB().

note: issue also reproduces when peripheral initiate paring request and central waits for it.

Steps to reproduce:

• Central (executing basic_ble_GATT_client) connects to Peripheral (running basic_ble).
• Both devices pair and bond (Pairing Status: Bond saved).
• Central enables and receives notifications.
• Central disconnects from peripheral and erase ALL bonds through GAPBondMgr_SetParameter(GAPBOND_ERASE_ALLBONDS, 0, NULL).
• Central connects to Peripheral.
• Both devices pair and bond (Pairing Status: Bond saved).
• Central enables notifications
• Pairing Status: Bond saved changes to Pairing Status: Encrypted on central and peripheral.
• Central can send data through GATT_Write to peripheral characteristic 3, which will echo the same data through the characteristic 4 as a notification.
• Peripheral sends notification to Central.
• Central does not receive notification (nor ATT_HANDLE_VALUE_NOTI event)