Applying an SPL downgrade package can cause boot failures
(/data failed to decrypt). Today's ota_from_target_files
tool already try to prevent this. But Packages generated
using older tools are still around.
Add check in recovery to prevent such OTA package from
installing.
Test: th
Test: Sideload an OTA with newer SPL, make sure check passes
Test; Sideload an OTA with older SPL, make sure check fails
Bug: 186581246
Change-Id: Icffe8097521c511e151af023a443ccbb4b59e22c
