Bluetooth: Add default wakeup callback for HCI UART driver

Bluetooth: Add default wakeup callback for HCI UART driver

Bluetooth HCI devices indicate if they are able to wakeup in the wakeup
callback since 'commit 4539ca67fe8e ("Bluetooth: Rename driver
.prevent_wake to .wakeup")'. This patch adds a default wakeup callback
for Bluetooth HCI UAR devices. It assumes Bluetooth HCI UART devices are
wakeable for backward compatibility. For those who need a customized
behavior, one can override it before calling hci_uart_register_device().

Fixes: 4539ca67fe8e ("Bluetooth: Rename driver .prevent_wake to .wakeup")
Signed-off-by: Ying Hsu <yinghsu@chromium.org>
Reviewed-by: Alain Michaud <alainm@chromium.org>
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>