SPARC64: PORT LDMVSW DRIVER TO UEK4

SPARC64: PORT LDMVSW DRIVER TO UEK4

      Port of the new ldmvsw (Ldoms Virtual Switch) driver to UEK4.
      This code has already been submitted and accepted
      into the mainline Linux kernel.

      The ldmvsw is very similar in function to the existing sunvnet driver. The
      sunvnet driver is therefore split to put the code common to both drivers
      into the kernel for use by both drivers when loaded (see sunvnet_common.c/h).

Orabug: 23215917

Signed-off-by: Aaron Young <aaron.young@oracle.com>
Signed-off-by: Allen Pais <allen.pais@oracle.com>
(cherry picked from commit 361afffe35368dc23d2c9df6d7797ccf9af8fe57)