Use S api in SettingsShim api 31

This is the follow up change of aosp/1700808. In that change, it still
use R api in shim 30 because S api is not available in AOSP at the
moment.

Bug: 182211575
Test: install S module to R device and both run mts tests build with S
and R.

Ignore-AOSP-First: aosp don't have S api
Change-Id: Iaa5d8d0c5de439da139cae954196f0378e88c372