Fix references to new S APIs without version checks

These new S APIs will throw UnsupportedOperationException
when running on an R device (even though it's called from
within the Wifi module!!!).

Add version checks before calling them.

Note that this is a temporary solution to unblock testing
S module on R base image. Will seek a better long term
solution.

Bug: 173791707
Test: S module on R base image boots and connects to wifi
Change-Id: I6b6920a0f948677767fa366f5db582ec799e08de