Delete SyspropMutator

This CL and its associated CLs point cc modules that rely on
sysprop_library modules to the auto-generated cc_library
module, and then remove the code in Soong which maps the
sysprop_library target to the generated target. This is being done
because Bazel will not be supporting the existing behavior in
Soong.

Bug: 226199990
Test: m
Change-Id: I117c5a4a9bf7c38e6fb7b92272a390df87507e30