Update the rich content UI to meet the UX design version 2.

1. Using the footerPreference component for the interface
android:desription.
2. Remove the redundant and unused codes.
3. Remove the ripple effect for AnimatedImagePreference.

Bug: 142532186
Test: manual test
Change-Id: I547ed7611b40d8b7bee4c4350b00bd4987768950
5 files changed