Add call button to details, increase hit area.

+ Add call back button in call details.
+ Increase touch target size of call back button.
+ Simplify tint styling and layouts.
- Delete asset which was duplicate of one in ContactsCommon.

Bug: 18331084
Bug: 21659613
Change-Id: Icbd5f66a294f1215dc2056e7f7aece2129af5630