clear all recents button

Clear all recents button cleanUp
reference https://github.com/CyanogenMod/android_frameworks_base/commit/6471aee7bec8e8d2eb179db9605d3b6a12ac48f6

Add touch feedback to the clear all recents button

Conflicts:
	packages/SystemUI/src/com/android/systemui/recent/RecentsHorizontalScrollView.java

Change-Id: I91c8c3473060101061f437585c871d854c7e4a09