1: add a quantity check in bt when writing paired device info into nvs.
2: delete the exceeded device info from NVS when get bonded list during
bluedroid initialization.
3: unify the process of bt and ble to load bonded list during bluedroid
initialization.
Prevent a remote device from doing a Bluetooth Impersonation Attack
(BIAS) by:
- Preventing remote device to downgrade secure connection
feature mask. Secure connection feature mask should remain same or
increase to enabled in link key generation and authentication.
- Doing a mutual authentication during Legacy Authentication.
Signed-off-by: Chinmay Chhajed <chinmay.chhajed@espressif.com>