Move StorageManagerInternal into services

Move StorageManagerInternal and ICeStorageLockEventListener from
android.os.storage in the core/ directory to com.android.server in the
services/ directory.  This makes these classes be built into
services.jar rather than framework.jar.  That's the way it should be,
since these classes are used only by system_server internally.  This
matches e.g. UserManagerInternal and LockSettingsInternal which are
likewise in services.jar, not framework.jar.  No functional change.

Bug: 430115876
Test: atest StorageManagerServiceTest
Flag: EXEMPT refactor
Change-Id: Idf4a6cee9a70f34dacef591799a646161f913083