Jarjar com.google.protobuf

This avoids potential conflicts if the library is also added to the
bootclasspath.

com.google.protobuf is pulled as a dependency when adding protobuffers,
like those used for data stall, IP provisioning and validation metrics.

Bug: 159587267
Test: m; manual: booted, wifi working

Change-Id: I3339e47c1ca1cd8b0186da0dbf880eff245b4c67