hammerhead: bluetooth: Use new-CAF map structure

* Use new structure for UART DT without wakeup_irq
  since wakeup_irq is controlled by bluesleep driver.
* Some tuning for bluesleep driver.
* Rename "host_wake" to "wakeup_irq" in bluesleep.
  (Since bluesleep and serial are different drivers
   serial driver won't conflict with wakeup_irq in
   bluesleep driver.

Signed-off-by: Pranav Vashi <neobuddy89@gmail.com>