Fix hot reboot in powermenu

Fixes AOSPA-557
Accessing showGlobalActionsDialog() from different threads
(one for broadcasts and one for the actual longpress power button action)
caused a hot reboot when accessing the power menu from quick settings and then from power button.

Change-Id: I4b6efd192404f073c0d1b5655152ae736a398cbd
Pie: Fix navigation icon hints being cleared on reorientation

There is no reason to recreate the PieControlPanel instance if it already exists.

Change-Id: Id7bb4946a8fbd4595e840c605b90b97cab7b38ca
Add EventLog event for logging of attempts to call java.lang.Object.getClass

Bug: 13694467
Change-Id: I886c6ffb3a008d0cf701c1adc16c607cbf7dce39