Quickly fade out the UDFPS icon on launch animations

As per the UX spec, the UDFPS icon will fade out in the first 83ms
of the launch transition animation.

Fixes: 276712829
Test: manually launch QR reader quick affordance
on the lock screen when UDFPS is enrolled, see the
UDFPS icon fades out BEFORE the activity is launched

Change-Id: I8293fd3b2e03859636496f3053ff3b33357bbdfe