Add resources.pb to the apex bundle

The file was missing.

Bug: 117295826
Test: tapas com.android.runtime.debug; m dist
$ unzip -l com.android.runtime.debug-base.zip
Archive:  com.android.runtime.debug-base.zip
  Length      Date    Time    Name
---------  ---------- -----   ----
 29614080  1980-01-01 09:00   apex/armeabi-v7a.img
       52  1980-01-01 09:00   root/manifest.json
      379  1980-01-01 09:00   manifest/AndroidManifest.xml
       59  1980-01-01 09:00   resources.pb
---------                     -------
 29614570                     4 files

Change-Id: I916ad5ba479c952a106b055c0e71e7e6556b6101