[cleanup] Enable clang-tidy and fix warnings

Clang-tidy found a bunch of warnings in the incfs code

Bug: 153704006
Test: builds & boots
Change-Id: I651633cb88767ce18f2b7919efb7c35718dbbe85
Merged-In: I651633cb88767ce18f2b7919efb7c35718dbbe85
4 files changed
tree: 9f4c4626580d2e7dfb2fc0e739dbd9f3acd59557
  1. incfs/
  2. libdataloader/
  3. .clang-format
  4. PREUPLOAD.cfg