Build dark greylist from public + light grey API

The dark greylist is meant to contain non-SDK APIs which are "related"
to APIs accessible to apps without restrictions. The list used to be
built as all non-SDK APIs in the same package as those on the light
greylist. That is not sufficient and should include the public SDK API
packages too.

This patch modifies the makefile to generate a list of public API DEX
signatures with Doclava and then use that as a basis for the dark
greylist generation.

Bug: 80461842
Bug: 64382372
Test: make out/target/common/obj/PACKAGING/hiddenapi-blacklist.txt
Change-Id: I4b1588013f26661207126b4006cdef0a0fc8ae2c