Enable Window Dumpsys Section

Protobuf defines classes, which can have self recursive message
definitions and cause a bug in generating privacy flags.
Solve the problem here. The details is in incident_section_gen/main.cpp.
The logic is a bit complicated to address more than one level of self
recursion proto message definition.

Also solve a bug when PrivacyBuffer strips fields.
Modify PRIVACY_POLICY_LIST to be type Privacy** in order to allow
initialization by a method.

Bug: 68162512
Test: unit tested and on device tests
Change-Id: I1d0b79f6813e5fd66c4cf5823d0fa17efc57bb1d