Fix or suppress tidy warnings-as-errors.

Use std::map instead of KeyedVector (deprecated) in order to avoid
unnecessary (and implicit) initialization of the value type. KeyedVector
does it even when only the key is neeed (e.g. indexOfKey). std::map
doesn't have such a problem.

Bug: 222775179
Test: unset WITH_TIDY; CLANG_ANALYZER_CHECKS=1 make -k
tidy-frameworks-native-libs-binder

Change-Id: I548fc96a34bac9c7135e206983150948dbca57d4