SlimRecents: Adress the 50ms touch unsresponsive issue

User reported that if the screen is fully animated in that the touch
detection is not working for about the first 50ms. For user who are working
fast this is indeed an issue. Especially due that the recent screen speeds
up the workflow much already.

Problem is our third loading stage due that after the recent screen animates in
it calls getView on all elements which rebuilds the touch listeners and cause to
the slight timeframe where it is unresponsive.

Well the third loading stage was a left over from the first optimizations when
we started to develop this feature. Other optimizations are into place now so we
do not really need the third loading stage at all. So instead of handling now
the fix in the getView implementation of the arrayadapter we simply just remove the
third loading stage completely.

PS:
- small other optimization

Change-Id: Ibf46fbe393de4f9d6b867e6bdb9c331dff1dd38e

Conflicts:
	packages/SystemUI/src/com/android/systemui/slimrecent/RecentController.java