Fix google-explicit-constructor warnings in system/core.

* Declare explicit conversion constructors.
* Add NOLINT for implicit conversion constructors.
* Fix also some misaligned indendations.

Bug: 28341362
Change-Id: Idf911f35923b408d92285cc1a053f382ba08c63e
Test: build with clang-tidy
5 files changed
tree: d6e6267444be6426ccb60d87b3d35328481e1a9e
  1. liblog/
  2. logcat/
  3. logd/
  4. logwrapper/