Revert "DexOpt anything on /system in /cache/dalvik-cache"

This reverts commit 8667070c091dfbd83087e9472072bce89e6cdf83.
Revert "Revert "DexOpt anything on /system in /cache/dalvik-cache""

This reverts commit 2decf53ade0050d3ff87b1140d5774bdbebf8f52.
There is no reason to update all the drawer when a single tile is updated

Change-Id: I75b768b01509a024fe9f974a19da829f68683318

Conflicts:
	packages/SystemUI/src/com/android/systemui/statusbar/phone/PhoneStatusBar.java