m8: increase ui responsiveness

* lower touchslop, improves scroll response
* speed up the notification shade

Change-Id: I0262a5b359d4298a44bf8211baca13e01fa59535

Conflicts:
	overlay/frameworks/base/core/res/res/values/config.xml

Conflicts:
	overlay/frameworks/base/core/res/res/values/config.xml