cros_generate_update_payload: Import installed

Don't import from platform2/installer, since it
might not be present in a minilayout.

Also stopped trying to import from /usr/lib/installer, since we never
install the script there in any environment I can find.

TEST=Built, build_image, network update a dut.

Change-Id: Ib00ea30bfb2c698edd03b502550691c52cda0557
Reviewed-by: Chris Sosa <>
Reviewed-by: Prathmesh Prabhu <>
Commit-Queue: Don Garrett <>
Tested-by: Don Garrett <>
1 file changed