zink: add a "compact" descriptor mode
this activates when running on a driver that has less than the normal 6 descriptor sets and compacts everything into 4, which is the minimum required by spec
fixes 1500+ crashes and 2000ish fails on turnip
this activates when running on a driver that has less than the normal 6 descriptor sets and compacts everything into 4, which is the minimum required by spec
fixes 1500+ crashes and 2000ish fails on turnip