Don't link the framework impl in docs build

This gives the docs build access to hidden symbols, which hides issues
in the documentation.

Baseline the newly discovered issues.

Bug: 217734059
Test: m docs
Merged-In: I357f5a341a170a37152d836861a330039a83886c
Change-Id: I357f5a341a170a37152d836861a330039a83886c

api/ApiDocs.bp

@@ -195,6 +195,8 @@ framework_docs_only_args = " -android -manifest $(location :frameworks-base-core
 
 doc_defaults {
     name: "framework-docs-default",
+    sdk_version: "none",
+    system_modules: "none",
     libs: framework_docs_only_libs + [
         "stub-annotations",
         "unsupportedappusage",