liblog: restructure log/log.h and android/log.h

We went too far, so this is a partial revert, part deux.

Keep general purpose logging macros in android/log.h for the NDK.
More internal features like Radio, System and Events logging are
moved back to log/log.h.  Correct liblog ndk symbols.  Correct for
some Android Coding standards.

Test: compile
Bug: 31992412
Change-Id: Id3731496fa226e8c170305d0d2a1859e8cf67e14