gn2bp: Update not to change Android.bp.swp every run

Order of set iteration is not the same everytime.
Sort before the iteration to make Android.bp.swp same every time we run
update_result.sh

Test: ./update_result.sh

Change-Id: Ie6495db1b2ad62113ba4fccb5d76d6590a91a5ba
2 files changed