Update stepped clock animation to use real specs.

This updates a couple of things:

* Overall clock animation time is 1000ms now.
* Interpolator for clock digits changed to EMPHASIZED.
* Each digit now has a 33ms delay between them.

Bug: 199051139
Test: Manually verified.
Change-Id: I3f2480822827bd9e08aeadb922e6c81c29947cfe