input: authenticate when connecting to a bonded device

input: authenticate when connecting to a bonded device

According to bluetooth HID1.1 spec, part 5.4.3.4.3:
If the Bluetooth HID Host is bonded to a Bluetooth HID device:
If encryption is not already enabled, the Bluetooth HID Host shall
enable encryption with the Bluetooth HID device before sending an
L2CAP Connect Request to open the HID L2CAP Control channel.

When creating connection, this patch checks whether the target
device is bonded, if yes then we use the medium security level
instead of the low one to enable encryption.

Signed-off-by: Anuj Jain <anuj01.jain@samsung.com>
Signed-off-by: Ayush Garg <ayush.garg@samsung.com>