Telecom: fix Blacklist support for L (1/3)

Change-Id: I967870b700d49c25be46aefad9bd2fb4efdc72de
Signed-off-by: Roman Birg <roman@cyngn.com>

Conflicts:
	src/com/android/server/telecom/CallsManager.java
Blacklist: fix NPE

getCallerInfo() can be null if the caller info is being
asynchronously read. Use a different method to get the phone number.

Change-Id: I4b77552a3e3cddd6d3fc9ba8e13721d7431f6141