Merge FileKey from jdk11u/jdk-11+28 into the expected_upstream branch

List of files:
  ojluni/src/main/java/sun/nio/ch/FileKey.java

Generated by tools/expected_upstream/ojluni_refresh_files.py
Test: N/A
Change-Id: I1aebab5bb925f52b26b4c8247d3cd22084d74a24
tree: 6117c1118b40c6e2d5f0d7b4c422a6907ac932ea
  1. ojluni/
  2. tools/
  3. EXPECTED_UPSTREAM