sparc64: mmap fixed and shared

sparc64: mmap fixed and shared

Older sparc64 must have a VAC because there is concern that mmapping fixed
and shared with incorrect align would cause cache aliases. To my knowledge
this is not an issue for sun4v. I will eventually research this.

The patch appears required for uek4 too.

We will enforce the rigid alignment condition only for tlb_type != hypervisor.

Orabug: 20426304

Signed-off-by: Bob Picco <bob.picco@oracle.com>
(cherry picked from commit 88b6df6b74de358992b2b58dab018672606975c7)
(cherry picked from commit 3daf2db176d2f874446d74839635e9bbaffccc7f)