This CL implements bp2build functionality for the cc outputs of
sysprop_library modules. cc_* modules depending on sysprop sources
will be handled in a later CL.
Bug: 244439349
Test: b build //system/libsysprop/srcs/...
Test: Inspect BUILD.bazel
Test: Unit tests
Change-Id: I6fa20661b984223347480c9afe0885b5db5a2807
