23ac404212
With block-based OTA v2 and v3, it requires stash space on the /cache partition to back up blocks during an update. We need to ensure that it doesn't exceed the partition size. Since there might be other files on /cache as well, we use cache_size * threshold as the maximum allowed size. The threshold defaults to 0.8, which can be overridden by command line option '--stash_threshold'. Change-Id: I1cce54b82280f803d626a69a087f706343d94bc7