Remove custom styles that have moved to supportlib

We moved several preference styles defined here in settingslib into the
support library, and don't need them here anymore.

Bug: 64689839
Test: visual (styles for things like icon spacing, dividers, etc. should
be the same)

Change-Id: Ic6c9c693dfc94a4dc7abb047a23fad06323f2855
2 files changed