ota_from_target_files: Allow specifying optional patches that don't get asserted during update

Fixes the issue where apps (e.g. QuickSearchBox) will always fail the assert if a different version (GApps) is installed

Change-Id: I149cedfcb575bfbd4b6f5e7fbe4853856128927d
ota_from_target_files: Add Provision.apk to optional patches

Change-Id: Icc3e15e2fcfad1e0db2338761cf41df2c328eaa1