Add usb and networkcapabilities back to core/proto

usb.proto and networkcapabilities.proto were moved to proto_logging
because they were needed in atom.proto. However, the majority of the
protos aren't needed and belong in core/proto. This moves the files back
in preparation for splitting the relevant enums back into proto_logging.

Test: m
Bug: 182392879
Change-Id: I055a3ca44b83921018697bdefec29161b483d0fe