Show bootanimation after decrypt

Because the original modification (restart SF which is added
for display bootanimation) from O to P causes bootanimation NPE,
 we remove the part of restart SF and add other flow to show
 bootanimation.

Test: manual, ran the test 10 times and it cause no NPE and
      display BootAnimation after decrypt
Test: boot aosp_sailfish

Bug: 79547653
Change-Id: I355ccdbb2e2f27d897e2e0ee00f9300ef38ede03
(cherry picked from commit f32c2017)