Camera: make HW-Capture key can not waken up the screen

When HW-Capture key is pressed,
will generate KEYCODE_FOCUS key event which wakes up the screen.

make KEYCODE_FOCUS key event not to wake up the screen.

CRs-Fixed: 516900

Change-Id: I93beb28b9981141b02fd9fc1223e97efd1ab400e