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Move secondary call information to the bottom, clear call context.
The secondary call information was obscuring the call context info because it was incorrectly being placed right under the primary call info. This is a bug because it should placed under the FAB at the bottom of the screen. Also hide the call context info when a new call comes in that does not have caller contex. Bug: 25222360 Change-Id: I7601ce7e7e2609ac046ea104651ac50d863a86bc