Refactor cquery processing to generalize transitions

This is a step in the right direction to allow generalized specification
of variant information in the form of configuration transitions, such
that not all transitions must be specified manually. This allows for
much more reasonable addition of new variations in mixed builds.

Test: lunch aosp_flame && USE_BAZEL_ANALYSIS=1 m libc
Change-Id: I95898da06af6d0e3e1f7c073aaf8ec0ebe26c951