Revert "Frameworks: port SlimSeekBarPreference to SlimLP"

This reverts commit 65f1acb975ecf4c4d7b34f301ec572b85b9a81d0.
Frameworks: port SlimSeekBarPreference to SlimLP

Patchset: materialize slider preference
Change-Id: I84c16cee9162a3fd53c0b62398a2ca03415ce974