Bluetooth: Kconfig: Fix BR/EDR dependencies

BR/EDR code should have minimal impact on LE code so to keep it simple
just require peripheral and central to be enabled when selecting BR/EDR
support.

Fix following Kconfig warning:

warning: (NETWORKING_WITH_BT && BLUETOOTH_BREDR) selects
    BLUETOOTH_L2CAP_DYNAMIC_CHANNEL which has unmet direct dependencies
    (BLUETOOTH && BLUETOOTH_HCI && BLUETOOTH_HCI_HOST && BLUETOOTH_CONN
    && BLUETOOTH_SMP)

Change-Id: I7f7cb8794def0df6daaa4abfe4596df460f1a2b2
Signed-off-by: Szymon Janc <ext.szymon.janc@tieto.com>