sparc64: tsb size expansion

sparc64: tsb size expansion

Orabug: 25448108

Some larger applications require a TSB size of magnitude not required by a
vast majority of processes. This commit enables the TSB to be expanded
to a size up to MAX_ORDER - 1, limited by TSB size order encoding and
finally limited by MMU hardware. The large TSB page order allocations are
not included in a kmem cache like current TSB sizes. The improvement is
done for tlb_type hypervisor and limited to recent sun4v. This patch should
not impact performance of other sparc64 core chip types.

Signed-off-by: Bob Picco <bob.picco@oracle.com>
Signed-off-by: Allen Pais <allen.pais@oracle.com>