Start using experimental APIs

Now there are two version of RavenwoodUiTest -- RavenwoodUiTest_noexp and RavenwoodUiTest_exp.

When running them via run-ravenwood-tests.sh, we run RavenwoodUiTest_exp
with experimental APIs enabled.

Also enable "any sysprop read" too if exp-apis are enabled.

Bug: 292141694
Flag: TEST_ONLY
Test: $ANDROID_BUILD_TOP/frameworks/base/ravenwood/scripts/run-ravenwood-tests.sh -s
Change-Id: I52213e42f3788bb71d3ba67834b4077efb2426dc