Enable readability checks

clang-tidy readability checks are overall a good thing, and help us to
write consistent and readable code, even if it doesn't change the
result.

All changes done by the robot.

Tested: Code compiles, inspection only (changes made by robot)

Signed-off-by: Ed Tanous <edtanous@google.com>
Change-Id: Iee4a0c74a11eef9f158f0044eae675ebc518b549