Add CrashRecovery stubs to core services

We would need to add CrashRecovery stubs to be present at build time for
"services" and "services.core.unboosted".
Adding this conditionally behind build flag.

Bug: 289203818
Test: builds successfully with flag enabled
Flag: build.release_crashrecovery_module
Change-Id: I983d5340a4a1d7097fa97f5230152dc83a42babb