support ZONE_RESET_ALL in liburing v3

Christoph Hellwig <[email protected]>
Newsgroups org.kernel.vger.io-uring
Message-ID <[email protected]> 
Hi Jens,

this is the liburing support for the just submitted ZONE_RESET_ALL uring
cmd support.  Also a few fixup for the discard support that stood model.

Changes since v2:
 - fix inheritance in the shared library map file

Changes since v1:
 - misc spelling fixes
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