Revert "Switch libplatformproto to sharedlib"

Bug:36847782

This reverts commit e5549d414c7231ee0037cf413dad17e28b8905ba.

Change-Id: I38f1c501b7e40be11ba5f0a7a50651e0c3e41fc5
(cherry picked from commit 817b4947397dc01d0c066ae847a3efd0e4a84a24)
2 files changed