PhoneWindowManager/KeyEvent: Camera key as WakeKey

As discussed in https://r.android.com/973723



This makes any camera key event wake up the device.
Handling of the camera key apart from waking up the device might follow
in a later commit.

Signed-off-by: Felix <google@ix5.org>
Change-Id: I44dbc3f9ac465f664b6d740cb6a056b7f6e118fb