Use RavenwoodRule for system properties

We're going to remove RavenwoodConfig and will start using
RavenwoodRule (again) for initializing sysprops.

Flag: EXEMPT host test change only
Bug: 377765941
Test: $ANDROID_BUILD_TOP/frameworks/base/ravenwood/scripts/run-ravenwood-tests.sh -t -s

Merged-in: I9b9a5c4f8987ba32353d25ebb3840b725c246e77
Change-Id: I9b9a5c4f8987ba32353d25ebb3840b725c246e77