Use optimized resource shrinking for SystemUI

This is using the new pipeline in R8 for optimized shrinking.

This reduces apk size by 3.96% on phone and -12.47% on watch!

Bug: 296870300
Test: Existing
Flag: NONE
Change-Id: I3a509c6d6f22af1713827c0a59911b937dcfda64
1 file changed