Build same hidden API lists as in pi-dev

P branch builds hidden API lists in a separate invocation of droiddoc
which includes @SystemApi and @TestApi annotated class members in the
public API. This patch creates the same build rule in the master branch,
only with Soong instead of Makefile.

Test: make out/soong/.intermediates/frameworks/base/hiddenapi-lists/android_common/private-dex.txt
Merged-In: Ifa912f8751025b7de24a982a1a227a9c27d18267
Change-Id: I80860c2b9f7213db65d0a9ca65bd645187aa0ce0