Forward Port: Volume button seek on screen off [1/2]

PS : Fix the short press event type

Change-Id: Id55a1240a133b5144502fced862bae040b390662

Conflicts:

	core/java/android/provider/Settings.java
	policy/src/com/android/internal/policy/impl/PhoneWindowManager.java
Frameworks: only send volume key events to the session manager if it is not a wake key

This fixes the problem of volume adjustment when volume wake up is activated and volume rocker
music search disabled.

Change-Id: I04873fd82885134c3674290dae530def269bfb50