Revert "SystemUI: some transparency manager optimizations"

This reverts commit 6a0bac5b69a9c39504c0af03d743bf2f414fbaa8.
SystemUI: animate transparency changes

Change-Id: I597b245b2d98ae42118efc1ba7ccb837edfdbea9
Signed-off-by: Roman Birg <romanbirg@gmail.com>