module-info: add missing package org.json

This is another package that was forgotten from
module-info.java, on top of the ones addressed in
http://r.android.com/523335

This CL adds it.

No effort was made to confirm whether any additional
packages were forgotten; I'm adding them as they show
up as compile-time problems. In the long run, this
file should be generated at compile time.

Test: Treehugger
Bug: 38177569

Change-Id: Ifa642478e89621d7ae83f8bf96f044940a0f9ad7