Add missing nullability annotations to java.lang.

This fills in all the missing annotations from partially-annotated
classes in this package found during validation.

Note that most of these are in the method/parameter annotation form
which metalava currently expects. The exception is on arrays, where
they are in strict type annotation form for forwards compatibility.

Bug: 64930165
Test: treehugger
Change-Id: I20e296ec6ce87dba89602958bee7e69f2e67f42e
7 files changed