[Ravenwood] Add an empty resources module

Partial cherry-pick from https://googleplex-android-review.googlesource.com/q/commit:e1c97fa712906b6eb4da0e37a55469fe38fc4f14

Bug: 339614874
Flag: EXEMPT host side change only
Test: $ANDROID_BUILD_TOP/frameworks/base/ravenwood/scripts/run-ravenwood-tests.sh
Merged-In: Ic9000d892d6b899ffbbbecb7d713fee19a601b07
Change-Id: I4d29272489c92f163ec2f509e72245bf8484f802