Change ravenwood default log level to verbose

- Otherwise, it'll be hard to debug issues from the log from the CI server.

- Also change all ravenwood related log to a "Ravenwood" tag, to make it easy
to filter out ravenwood log.

Bug: 380949304
Test: $ANDROID_BUILD_TOP/frameworks/base/ravenwood/scripts/run-ravenwood-tests.sh -s
Test: ANDROID_LOG_TAGS='Ravenwood:s' atest -t RavenwoodBivalentTest
Flag: EXEMPT host test change only
Change-Id: Ia114d094256b365beea55c905766a4602852c742