Convert IResourceManagerService to stable AIDL

Convert with minimal change to the interface itself.

Add additional test to cover DrmSessionManager's usage
of possible negative value field (which is signed now).

bug: 142396029
test: ResourceManagerService_test, DrmSessionManager_test,
CTS ResourceManagerServiceTest;
Manually check battery stats reporting.

Change-Id: I5c537a54efc2663281c96ddbdbd4ee56f23c1adf