Add clipToOutline to the background views in people tile layouts

Also, add missing theme values to the dnd suppressed layouts

For the resize handles to use the different corner radius,
android.R.id.background needs to be used for the clipped background
View.

Bug: 180580427
Test: verified locally
Change-Id: I466003d1b5b37226f28ef146a62ce5fd5102188c