Expose TocFile via CcTocInfo
Move the logic for identifying the toc file into Starlark
instead of the Soong Go code.
Test: build/bazel/cquery/request_type_test.go:TestGetCcInfoParseResults
Test: cc/library_test.go:TestCcLibrarySharedWithBazel
Test: build/bazel/ci/mixed_{libc,droid}.sh
Change-Id: I2de8ad18b08504b0d5a966049f2dec9a7db34f64