Fix/suppress system/keymaster google-explicit-constructor warnings

* Add explicit to conversion constructors/operators
* Use NOLINT or NOLINTNEXTLINE to suppress warnings on intended converters
* Some source code format changed by clang-format

Bug: 28341362
Test: make with WITH_TIDY=1 DEFAULT_GLOBAL_TIDY_CHECKS=-*,google-explicit-constructor
Change-Id: Icd9fbdb0ea7bc5b75015b07d73aaa21ae5ee8be7
17 files changed