Update FingerprintEnrollFindSensor for landscape

SUW library can support landscape mode. It reuse the portrait layout to
render the screen for landscape. So we don't need to have a layout for
it. This change is to move the description to a subtitle and remove the
unused layout.

Bug: 179234361
Bug: 171294253
Bug: 179317709
Test: visual verified
Change-Id: Icfb3be799c1b4e190691731638aaa3467cadf624