EDAC, pnd2: Build in a minimal sideband driver for Apollo Lake

EDAC, pnd2: Build in a minimal sideband driver for Apollo Lake

BugLink: http://bugs.launchpad.net/bugs/1709257
I've been waing a long time for the generic sideband driver to
appear. Patience has run out, so include the minimum here to
just read registers.

Signed-off-by: Tony Luck <tony.luck@intel.com>
Cc: Aristeu Rozanski <arozansk@redhat.com>
Cc: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
Cc: Patrick Geary <patrickg@supermicro.com>
Cc: Qiuxu Zhuo <qiuxu.zhuo@intel.com>
Cc: linux-edac <linux-edac@vger.kernel.org>
Link: http://lkml.kernel.org/r/20170803210536.5662-1-tony.luck@intel.com
Signed-off-by: Borislav Petkov <bp@suse.de>
(cherry picked from commit 3e5d2bd19138d6683f69de26a34d7eb9ab3823ed linux-next)
Signed-off-by: Seth Forshee <seth.forshee@canonical.com>