This patch fixes the DMM for user space buffer.
The Ducati virtual address that was mapped was
initialized to 0 instead of using the one that is
passed to the map function. Also, this includes
the fix for VM_IO part where teh va was incremented
twice.
Signed-off-by: Hari Kanigeri <h-kanigeri2@ti.com>

Signed-off-by: