Camera : Powerkey shutter (1/2)

Allows user to take use power key to take pictures/videos

Change-Id: I85a1e1761199f4604672be42a3a5005227f5451a
Underp public API... again

Change-Id: Ibb8d74cec9de3c2227451d33f3fe4ce82a731514
Underp the Underp public API... again

Change-Id: I7841c3c4d58dc224dc0e83f46b06cb1de93987a2
Fix Power Shutter Exception 2 of 2

Set protection level to 'dangerous'

Change-Id: I9792f4c543c9ce8a647989ca60cdc9389602551c