tmem: Delete deduplication (and tze) code.

tmem: Delete deduplication (and tze) code.

Couple of reasons:
 - It can lead to security issues (see row-hammer, KSM and such
   attacks).
 - Code is quite complex.
 - Deduplication is good if the pages themselves are the same
   but that is hardly guaranteed.
 - We got some gains (if pages are deduped) but at the cost of
   making code less maintainable.
 - tze depends on deduplication code.

As such, deleting it.

Acked-by: Andrew Cooper <andrew.cooper3@citrix.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>