Change tests' package names

When we apply a new ravenizer tool on test jars, we want to avoid making
changes to ravenwood code, which is under `com.android.ravenood`,
`com.android.platform.test.ravenwood`, etc. (it's not consistent
unfortunately)

But we still want to apply it to ravenwood test code.

So let's make sure ravenwood tests don't share the same packages
as non-test code.

Flag: EXEMPT host side test change only
Bug: 292141694
Test: $ANDROID_BUILD_TOP/frameworks/base/ravenwood/scripts/run-ravenwood-tests.sh
Change-Id: I193f2a0bd715ffde0e28709b8b919e7d8738d7ab