base

Change EndCallBehavior while in UTS test mode.

When in UTS test mode this reverts the behavior
of the end key as it was in cupcake. When not in
UTS test mode the behavior is as before the change.

The UTS test mode is enabled when presist.sys.uts-test-mode is 1.

Bug: 2402366
Change-Id: I81359f3870a1e4da513f76c32aecdb7dfdf3bacf