memory: sparc64: Add privileged ADI driver

memory: sparc64: Add privileged ADI driver

This patch adds an ADI driver for reading/writing MCD versions
using physical addresses from privileged user space processes.
This file maps linearly to physical memory at a ratio of
1:adi_blksz.  A read (or write) of offset K in the file operates
upon physical address K * adi_blksz.  The version information
is encoded as one version per byte.  Intended consumers are
makedumpfile and crash.

Orabug: 2617080
Signed-off-by: Tom Hromatka <tom.hromatka@oracle.com>
Reviewed-by: Anthony Yznaga <anthony.yznaga@oracle.com>
Reviewed-by: Khalid Aziz <khalid.aziz@oracle.com>
Reviewed-by: Shannon Nelson <shannon.nelson@oracle.com>
Signed-off-by: Allen Pais <allen.pais@oracle.com>