[java9] Convert hiddenapi-list target to Metalava

This blocks how we try java9 for droiddoc since "hiddenapi-lists-docs"
targets depends on libcore sources. So migrate this target to Metalava.

Test: m -j hiddenapi-lists-docs
Bug: b/78245848
Change-Id: Iae47d351d974e33490c3a1e9bb9f0f5d15eedfaf
Merged-In: Iae47d351d974e33490c3a1e9bb9f0f5d15eedfaf