Bluetooth: Use explicit check for BR/EDR device type

The BR/EDR and LE setup procedures apply only to BR/EDR device types
and so check for that explicitly. Checking that it is not an AMP
controller is dangerous in case there will be ever a third device
type.

Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>