Fix Navbar longpress power button

custom lonpress action showed global power screen instead of doing
the right action in front. Due we called POWER_SERVICE it was clear that
longpress will open that windows. Using now Power Manager to get
phone into deep sleep

Change-Id: Idd760e99699beb558587338b76f5c39572c37828

Conflicts:
	packages/SystemUI/src/com/android/systemui/statusbar/policy/ExtensibleKeyButtonView.java