Bluetooth: btmtksdio: enable bluetooth wakeup in system suspend

The BTMTKSDIO_BT_WAKE_ENABLED flag is set for bluetooth interrupt
during system suspend and increases wakeup count for bluetooth event.

Signed-off-by: Zhengping Jiang <jiangzp@google.com>
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>