[SPARC64]: Add missing HPAGE_MASK masks on address parameters.

These pte loops all assume the passed in address is HPAGE
aligned, make sure that is actually true.

[ This also includes other hugepage bug fixes for sparc64
  that occurred between 2.6.16 to 2.6.20 ]

Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Adrian Bunk <bunk@stusta.de>