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
m8: Remove composition property

Change-Id: Icb3495d67154eb8124b0b7945975e27ae7414f5c
m8: add bdroid config

Change-Id: I5fad4668f66d757a5506ea1c525881fbb0c64717
m8: switch to 400 density

Change-Id: I09f7bbe802c9ac7b6d7ad9dc1295b494b31f39d0