Bluetooth: HCI: Fix option CONFIG_BT_HCI_ACL_DATA_SIZE default to 0

Fix CONFIG_BT_HCI_ACL_DATA_SIZE default value set to 0 when data length
feature in the controller is not enabled. In this case the default value
will be set to 0 which is outside of the range specified for the option.

Signed-off-by: Joakim Andersson <joakim.andersson@nordicsemi.no>