Enable clang-tidy (and fix warnings) am: 9a3792e777 am: 066421180c am: 2bcbeb79eb am: 5cef599611

Original change: https://android-review.googlesource.com/c/platform/system/keymaster/+/1674707

Change-Id: Ia7a6a6cebd39be1ea8c115614ba6dbf4cab3a8d4