sun.security.jca.ProviderList: add serialVersionUID to EMPTY_PROVIDER

As of jdk8u60, a serialVersionUID was added to this class.

Note, the number doesn't coincide with the default as computed by
Android (but it does wrt the RI). Using the one in the code from the
OpenJDK for now, and adding a TODO for that separate issue.

Bug: 29631070
Bug: 33172161
Test: make droid
Change-Id: I7f8b609200a6b5630ce9e3f75b44964573b4b68f