[PATCH] NVMe: Create discard zero quirk white list

[Keith Busch]

On Fri, Mar 04, 2016 at 10:04:43AM -0800, Christoph Hellwig wrote:
> Not happy about this, but I guess we'll need something like this in the
> long run..

Cool, thanks for the feedback. I mainly wanted to confirm there wasn't
a better way to do this.

I will need to resend as I merged this from an older branch, and flag
value is already claimed for a different quirk.