Fix issue #2540920: connectivity issues with tripit/pandora

Need to be sure to compute gids when SD card is mounted, since we
need the package info for that.  Note that this is not re-granting
permissions (and in the future we could optimize this to just pass
through the mounted apps).

Change-Id: I51e1c23d17a6429642132902ef75c65a307fc33a

services/java/com/android/server/PackageManagerService.java

@@ -9579,6 +9579,9 @@ class PackageManagerService extends IPackageManager.Stub {
            }
        }
        synchronized (mPackages) {
+           // Make sure group IDs have been assigned, and any permission
+           // changes in other apps are accounted for
+           updatePermissionsLP(null, null, true, false);
            // Persist settings
            mSettings.writeLP();
        }