Add org.chromium.arc to package_whitelist.txt

Add org.chromium.arc to package_whitelist.txt
This is needed from the org.chromium.arc EventLogTags file.

Bug: 70513529
Test: compiled on marlin. did not generate any conflict. marlin worked
      Ok

Change-Id: Ia4b0133f66677f988916457ab4b6c9332342a01b