Add spam indicator for notification and incoming call of incallui.

+ Add spam icon and label in notification of incoming call.
+ Add spam icon and label in primary call info of incall screen.
+ Change background color and status bar color if primary caller is spam.

Screenshots:
https://screenshot.googleplex.com/WFob2oPdXZd
https://screenshot.googleplex.com/ddCfg91Anef

Bug: 27611253
Change-Id: I03b3754f69631f5f6b07932b1a0006407b93c6e8